A clogged air filter can cause strange whistling or low humming noises. Most commonly, technicians will recommend using a melamine foam around the blower intake. Luckily, there are several inexpensive ways to soundproof the whistling noise coming from HVAC vents. com When it comes to air returns making funky noises, though, there are usually a few common culprits: Dirty air filters and/or air ducts: Typically, air returns are covered with vents or grills. I thought this was noise from the blower or something. Pics here. The ducts should be made stiffer. Technical note: The D'Arcy-Weisbach equation for pressure and head loss can be used to calculate the actual pressure loss due to friction in a building piping or air duct system. Attach start collars to the duct with ¾-inch self-tapping sheet metal screws. Conversely, when ducts are too big, the opposite problem can result. Oct 21, 2004 · But for the purposes of home heating under atandard conditions, the volumes are the same. Return air vents are not rocket science. Feb 8, 2011 · So loud that we are constantly adjusting the volume on the TV as the fan kicks on and off. May 25, 2022 · To help you get rid of this annoying sound, we have consulted HVAC experts. From the return air grill, you can see the air filter, and, if it is removed, the blower Jul 23, 2008 · The hallway has a bathroom and a mechanical closet off of it. Aug 18, 2023 · 1. 10" diameter flex duct run (about 6' in length) to an approximately 18x18 return grill in the basement living room. Thanks! I’ll dig around tomorrow and see if I can’t find it. When the furnace lights you can hear significant combustion noise, and when the fan is blowing the air movement is loud, and fast enough to produce a slight whistling through the vent. HVAC Return Air Duct Leaks & Obstructions that Reduce Return Air Flow Rates. It's the air blowing OUT of the louvered openings that is super loud, particularly close to the unit in the attic (there is a unit outside the house as well). Its ductwork acts as a path sound travels along, creating a “highway” of noise traffic throughout your house. Adding mass to the existing space. I know that's not the best for acoustics but it is what it is. Mar 3, 2022 · Noisy AC HVAC Return VentPublished: 03/03/2022Thank you for checking out our video. Conversely, with return air vents, you’ll find the air trying to pull the paper into the air vent. You seem to have a very small return. May 31, 2013 · Some time ago, we removed a whole-house humidifier that was mounted to the return and covered the opening with sheet metal. This kind of setup causes two problems: When bedroom doors are closed, the return is starved for air. If you open the return, you can see the blower motor/squirrel cage fan just about a foot away. Single Return Duct – If there is only one return duct for the entire HVAC system, the static pressure is likely to get too high for the return duct to handle, creating excess noise. NathansHVAC. You can use a damp cloth to clean the inside of the vent, too. In most cases, a high-pitched whistling sound means that your air conditioner isn’t getting enough airflow through the return vents and ductwork: the ones that pull air from your home to the air conditioning evaporator coils to cool it. Feb 16, 2018 · you can build a plywood box to fit over the unit, lined with eggcrates, or with insulation to deaden the sound. I have two AC return vents in my townhome (3 floors and a basement). Oct 30, 2022 · Duct debris: Blockages in the return vent cause the furnace whistling sound due to air slipping through small openings between the contaminants. Purchase a new filter with the exact same style and dimensions and install the new filter. To solve this issue, ensure that all your vents are clear of obstructions and have proper airflow. Return grilles, especially those connected to a well-maintained HVAC system, may produce less noise transfer between rooms. Your solid door idea depends on a couple variables, 1. Now I can her that sucker every time it is on. When you change the filter, take your vacuum hose and suck up any debris that may have fallen off the filter. Jul 5, 2021 · I just had a new HVAC installed and I did this for my air return using Amazon. (Texas, so a lot) Jun 28, 2021 · Add Sound Insulation – Sometimes, a furnace blower will be inherently noisy. Whether it’s coming from the supply duct or the return air channels, the noise is probably the result of normal fan operation. Apr 29, 2022 · 3. Here are some simple steps to fix a noisy air vent. That includes changing dirty air filters, wiping down vents and dirty burners, and Most Common Reason: Low Return Airflow. Apr 21, 2018 · 1. You can wrap the pipes through which the air moves with insulation and Tuck Tape. May 19, 2024 · Try to hear where exactly the whistle is coming from. Fan speed may be set too high for ductwork available. When the fan is running, it creates loud white noise that makes it hard to hear or talk. This reduces noise and increases airflow. See 2 previous. 24X14 grille should be 14X36 (a 14X30 would flow air easier then the 24X14, and be less noise, how much, can't say) 8X8 should be a 14X14 with a 9" flex. Gas pressure issues, dirty gas burners, a damaged belt, restricted airflow, issues with the capacitor and fan – all these things can make your furnace noisier. If the latter, you might be able to program a slower speed on the furnace control board. There are basically two things to pay attention to. Use two needle nose pliers and adjust the louvers to a more open position. Here's what they have to say. You'd probably want some professional help doing this because if you run your furnace too slowly it could cause different parts to overheat or freeze and be bad for system lifespan, so the system needs to be checked after any speed adjustment is made. 1. Issue 2: Supply and return vents too close together. When it’s hot or cold, the metal expands and contracts. I'm some having some issues with the noise generated from our HVAC return. On 2020-07-10 - by (mod) - return air filter humming noise. Air intake must equal air return. If you want similar results to the ones you’d get with drywall and gypsum, you can look into using an acoustic sealant to plug your vent. Secure them to some sort of structure so they don't get pulled into the blower. The unit is in the basement, 10 feet away, and it is in an area that is separated with the air below the return ducts. If the return airflow Apr 7, 2024 · 2. The air filter is a critical part of heating and cooling your home. Mar 16, 2024 · Unusual sounds, particularly loud noises, coming from a furnace can be indications of various problems within the system. Lack of return/return air to small. So loud it hard to hear the TV when it's on. Oct 31, 2022 · Is your air conditioning system making an annoying whistling noise? Discover the reasons why and what to do about it in this blog post. I think the sheet metal duct is not designed properly which creates friction/noise. The return air ducts help pull the air as it is being pushed. Jan 24, 2015 · The rest of the house has the same walls and doors as when the house was built in the 70's. We have an open plan living room / dining room / kitchen and the HVAC return is located on the shared wall of those three spaces next to our dining table. Since the air return sucks air, they are prone to getting clogged, especially if your home is particularly dusty. Duct tape or clear hi-temperature silicone can be used in a pinch to seal them off. Older burners can rust or get clogged by debris. According to 24/7 Home Rescue, “This blocks the flow of water and causes some water to boil, steam and expand,” as in a kettle. This duct is about 15 feet long in total with two 90 degree bends. 7. Taking the cover off makes the noise drop quite a bit, and allegedly then a 01 - Clogged Air Filter. Temperature and air pressure can make your furnace bang. Contact a reputable HVAC company to inspect the air conditioner and the ductwork to isolate the problem and Jan 11, 2019 · Some return grille noise is caused by the filters used. This video shows how to reduce the air noise on a undersized Sep 9, 2022 · If an HVAC Return is loud, it’s likely due to dirty vents or ducts, the air filter needs to be replaced, the system or vents were improperly installed, or the system is in need of an upgrade. One return is a short approx. AC return vents pretty loud - called a pro and he said nothing could be done. The duct fittings should be smooth to allow for smooth velocity changes. The return vent is right across the door of one of the bedrooms. Noise Sensitivity. It’s only loud coming from the air return vent that is coming out from the side of the closet that the HVAC is in, which some Googling has told me is “normal” in the sense that it shooting essentially almost straight out with minimal turning will make it loud. Undersized ducts can lead to excessive air velocity, resulting in noise generation. The AC is loud, it's a newer unit. If the air coming out of your vents is too fast, it can create a loud noise. This can cause parts to warp and crack, making banging noises. Jan 28, 2015 · Fiberglass Duct Liner: () Or if you have the space for it, build some baffles out of 2x4' acoustic ceiling tiles inside the return chamber like below. If you do enlarge the duct you could try some sound deadening called duct liner. com: Noise Grabber Mass Loaded Vinyl 4. 5’ x 15’ (67 SF) 2 LB MLV Soundproofing Barrier, Made in The USA: Musical Instruments and 3M Amazon. To move the air your system needs, quietly. Jan 28, 2024 · The only return (20"x20") faces the living room area. #1 · Aug 22, 2010. Jul 18, 2012 · 654 posts · Joined 2012. the furnace sounds normal when the heat is on. Boilers also whistle, which could be an effect of either kettling or trapped air in the system. George 6 days ago · To soundproof the HVAC system’s air vents, materials such as duct liners, soffits, and sound baffles are some viable solutions. In order to reduce or completely remove the noises that occur in your furnace ductwork, you can check the dampers. This is a fire hazard, so unusual loud bangs should be inspected immediately. The main return is in the dining room first floor and is about 8 ft from the air handler. Steps for Quieting a Noisy Forced-Air System. Jan 22, 2019 · Hello Everyone, homeowner here with a 2 story (with basement) 2200 sqft 1940s craftsman house. I would say the return duct is about 10x10, but I can measure exactly when I am home. After that, I waited for the air to cycle on / off, and I was pleased to find that the noise was gone. But if the low whirring noise becomes distorted and amplified, you shouldn’t just put up with it. So, the air vent does not produce unpleasant noise. I then placed my hand over the vent and come to find out, the grill is vibrating and causing the noise. 5 tons to 5 tons. Hello hello. Update: So I've read a bit online and it seems most of the advice it to either lengthen the return air duct, adding baffles, which isn't possible because the return air grill sits directly in front of the blower with about 12-18" of clearance between them. Oct 10, 2022 · In an ideal HVAC design, your home would have an air return in every bedroom. After removing the screws and cutting through the mastic, I exchanged the sheet metal for a return vent grille. Here are the ways you can soundproof the air vents in your house. In my home the air filters are located just inside of the two large Oct 9, 2022 · If the air moving through your system makes a lot of noise, the first things to check on are: Closed vent dampers: One closed damper probably won’t make much difference but closing several dampers at once might make your system noisier. May 10, 2024 · Why You Can Trust Us. That will give a number to go with in terms of duct size. Fixing the noise problem is easy. Nov 9, 2020 · The HVAC return is in our main room, high ceilings, large room, tile floor. Fill the Opening With an Acoustic Sealant. Sometimes, though, they can be incredibly noisy which can be inconvenient and annoying. See full list on angi. When the thermostat signals for heat, the burner’s valves turn on and start emitting fuel. 38K subscribers. Photo: ungvar / Adobe Stock. #8 · Jul 25, 2012. Using Vibration Mounts for the HVAC. Inside the furnace are a series of burners that ignite the oil or gas and generate heat. Jun 21, 2023 · Temperature Changes and Air Pressure. Not only does it filter the circulated air you breathe, it also helps keep the furnace heat exchanger, air ducts, and air conditioner coil from clogging up. If noise transfer is a concern, be cautious with transfer grilles, as they can allow sound to travel between rooms. Next, clean the filters and air ducts regularly to prevent clogging and overworking of the system. Blocking vents can cause your HVAC system to work harder and become less efficient, ultimately increasing your energy bills. Closing supply vents put undue stress on your HVAC equipment. The cold air return is connected to the unit with a big circular shiny metal duct about 2 feet in diameter. Go back to the room where you cut the hole for the return vent and place the vent cover over the opening, lining it up so that it fully covers the holes. Decoupling the walls. The Engineering Toolbox provides the D'Arcy-Weisbach formula: Δp = λ (l / d h) (ρ v 2 / Aug 24, 2018 · SOURCES AND CONTROL. Open your unit’s cabinet and check out any debris or dirt buildup. sounds like ~ 1200 CFM total ( total 12"x18" inside dimensions duct board needed ) 1. There are two return ducts terminated at the return plenum with a 16x24x1 filter in front of the blower. 83K subscribers in the hvacadvice community. I either lose sleep because of the noise, or because of the dry heat blast. Face velocity is the air velocity at An air conditioner whooshing sound resembles a rushing or blowing noise. In this quick video we’ll show you how to fix a noisy HVAC return air vent Mar 26, 2024 · To properly cover a return air vent, the free area of the decorative material must match the free area of the return air vent. The other day i noticed a rather loud humm comming from my return air vent in the theater. When you locate a supply air vent, it’ll have a fan effect, trying to blow the piece of paper out of your hands and into the room. Adding some insulation to the system can help dampen the sound. When heat builds up due to poor airflow—think clogged Cabinet width would indicate 80000 or 100000 btu way too big for supply ductwork and "plenum". It’s a complex system that needs balanced airflow. In HVAC, we usually design the face velocity of vents (supply and return) to be around 500 FPM (feet per minute) or 2. If it is, then, soundproofing the duct may not be the answer. Jan 28, 2023 · A loud furnace fan can be caused by a cracked heat exchanger. When we do HVAC maintenance, we’ll look at your return vents and discuss your air filter choice s with you. Running at a lower fan speed (it is a variable speed system) the sound is roughly 68 decibels, which is much more acceptable. Make sure all the vents are securely screwed to the wall. The last column is the number of round rigid duct you need. Runs great, sounds smoother but it's loud. The air return grill is 20x30 that has been framed to accept a 16" duct that goes to the HVAC unit. this will cut down the sound dramatically. Add another small (14"x14" for up to 450 CFM with 8"x14" ductboard ) return to reduce air flow through the 20"x20" filter. Soundproofing the door – sealing the gaps and adding mass. Remove the vent cover or filter cover (they usually have tabs you can rotate by hand to unlock) and slide out the filter. Banging noises might indicate a furnace with carbon accumulation. Using a pleated filter (the white kind) instead of the fiberglass type will choke the air flow a bit more and Noise is a ductwork undersizing problem. Lining the duct with fiberglass duct liner stops reflection of sound and quiets the Jan 31, 2022 · The central return’s bad rap is the result of poor duct design. To reduce the noise more than "slightly" you need to move the unit away from the wall and give yourself a return trunk with some hard corners to absorb the noise. I just moved into a new apartment yesterday and have realized that the air return noise is extremely loud. Jul 4, 2018 · Forum Rules. On 2020-07-10 - by (mod) - super let me know what you find. The cold air return is exceptionally noisy. Apr 15, 2016 · This video shows how to reduce the noise on a simple return air plenum. So yea, the supply vents are the things creating the noise, not the return vents. Mark the center of start collars on the return and supply side of the heating duct. In other words, there is basically direct line of sight from the fan into the living room and almost no return length. 6. Mar 2, 2010 · 2 - Check the Dampers. The HVAC unit is connected with a straight ductwork run about 2' long and ends in a punched metal grille. They allow air to both enter and leave the HVAC system and maintain proper air pressure within the house. Motor noise not a contributing factor. If that one where to be size increased, more than likely and effectively, the intake air noise would be gone. Cut holes in sheet metal ducts using a drill fitted with a circle-cutting jig. com: (1 Pack) 3M 1 Inch Width 15 Ft Length VHB 5952 Black Heavy Duty Multipurpose Double Sided Tape: Office Products. These noises can occur when the heating or cooling unit turns on or off, and sometimes persist throughout the cycle of the HVAC system. Use wood screws and a screwdriver to secure the vent cover to the wall. Soundproofing HVAC systems can be the most challenging because they involve ductwork buried deep in a home’s structure. I'll keep this short and sweet. I just recently experienced the same thing when buying a house. ”. It could be the reason behind the irritating noises from your HVAC. Check The Vent Covers; Clean The Filters; Check The Ductwork; Reduce Static Pressure; Consult A Professional HVAC Technician May 22, 2022 · Here are a few suggestions to quiet return air vents. It is loud and annoying. This would cause a variable speed to ramp up as it will and wants to move more air then a standard blower. The dampers are either set in an on or off (open or closed) position. System information is: Trane S9v2 furnace and XR16 AC. The return is located right in the dining area which shares an open space with the living room and kitchen. Furthermore, without a return air duct in each major room, the supply duct air has to "push" all of the air in the room out of the way as it makes its way towards you. Within the furnace, the heat exchanger is the component that heats up the air. You might be able to fix a few of these issues yourself, but in most cases, you’ll have to hire an HVAC technician to diagnose and fix the Oct 31, 2023 · Photo: Jason / Adobe Stock. Addressing the underlying cause of noisy air vents is vital, because operating the 4 days ago · A utility closet can be made soundproof by the following methods:-. Now you have to learn how to reduce noise through wall specially from return air. The furnace and air handler are located in basement. An HVAC return air can be in the floor, but they work much better on walls up about 7 feet. It may be possible to reduce the noise level by changing the furnace or blower enclosure. The area around the return vent looks like it's Nov 24, 2010 · Your return grilles are all too small. 69 posts · Joined 2007. Based on 400 CFM per ton, the corresponding airflow is also provided. 4. They will be able to advise you on the specific steps involved in what to do when your HVAC unit is making loud or strange noises, and may also be able to immediately dispatch a repair technician, depending on the severity of the situation. Oct 25, 2023 · Furnaces get dirty, just like your ductwork and filters. The return vent was in the family room and LOUD. Subscribed. 850. Apr 22, 2014 · The closest cold air return is about 5' away (laterally) in the ceiling of the hallway right by the bedrooms. The system is thus very loud; I measured ~70 db+ a few feet away. what does the furnace use as a return, is the return a hole on the side of the furnace with the filter there or does it go out into the house and have grilles in various locations 2. Keep reading to learn details about all the different causes Oct 14, 2023 · To quiet a noisy air return in an HVAC system, there are several steps you can take. At the same time, it should not cause the air velocity to increase too much as the return air vent will produce whistling noise. if the return is specifically in the closet, you need to have Sep 24, 2023 · When deciding between transfer and return grilles, there are a few factors to consider. Common causes of AC whooshing include a clogged air filter that restricts airflow, leaks in the ductwork, blocked vents, blower fan issues, and a damaged fan motor. The return air is too close to the furnace as is your chair. May 5, 2016 · If the usual noise volume increases, or you start to hear flapping, rattling or high-pitched sounds from the supply vents, return grilles or ceiling diffusers, it's likely due to an increase in pressure caused by airflow restrictions somewhere in the HVAC system. When air return vents are not working properly, the entire HVAC system suffers. Look at those dampers that are on the supply side of your ductwork (the ducts responsible for supplying the air flow, not the returns). Feb 16, 2017 · Pull off the metal grate and wash it every so often. Bend the vanes (fins on the vent) straight to allow more airflow. When ducts are too small, it can create a buildup of pressure in the system, which results in a clicking or popping sound. Our house has two vertical air shafts that run parallel to each other, one for supply and one for return. Mar 26, 2024 · Root Cause One: High Air Velocity. If all else fails, you can reduce noise by increasing the return grille’s open area. Nov 24, 2015 · When I try to close the supply vent it produces a really loud whistling noise. If the duct is too small your overheating the furnace and shortening it's life. Aug 4, 2007 · The HVAC unit is right underneath the hallway in the basement. First, open the vents to relieve pressure on the system. The blower is very loud, and it makes sleeping in that one bedroom an interesting experience. Jul 30, 2010 · Then he says it is loud because the unit is right below it. (Increase return and line it with ductboard for sound control). Dip switch’s not set up right for the tonage of the a/c unit and Is trying to move to much air. Mar 22, 2008 · Aprilaire Humidifier Mounted on Return is loud! I had my Aprilaire Model 700 Humidifier Mounted on Return duct next to the furnace. Your air conditioner has to work harder to pull enough air through Aug 22, 2010 · G. As per the ASHRAE Handbooks, “A primary objective in the design of HVAC systems and equipment is to evaluate noise and vibration to ensure that the acoustical environment in a given space is acceptable for various occupant activities. Matching supply and return airflow: It is crucial to maintain a balance between the supply and return airflow. Sep 14, 2018 · Reduce Air Noise on a Loud Return Air Vent - YouTube. gtbuzzzz Discussion starter. If your HVAC equipment is making loud noises, the first thing to check on is the fan. Not only does the HVAC system create noise, it carries noise from one room to another. One return is right by my kitchen/living room and another is at the top of the stairs to the 2nd floor, right next to the entrance of my May 11, 2024 · By being familiar with the cause of noisy air return you can easily eradicate the issue. RobC on Aug 13, 2020. If you don’t end up finding any dirt or debris, proceed to check the fan blades. In the infographic to the right, you can see that leaks in return vents are a common duct problem. Instead, you ought to learn how to reduce the return air Sep 7, 2020 · Air return vents are one of the most important aspects of your home’s HVAC system. Sep 20, 2023 · There are several ways to deal with breakout noise, they include: Ensure that the air velocity in the main duct doesn’t exceed 1500fpm, while the velocity in the branch ducts shouldn’t exceed 600fpm. 161K views 5 years ago. The return is about 20ft long. On 2020-07-10 by George t. . A place for homeowners, renters, tenants, business owners or anyone with a general question about their… The furnace filter is located right behind a large return vent in the wall or ceiling or right next to the furnace itself. A single return duct is common in small homes and condos and can only be fixed by installing more ductwork to reduce the static pressure. If there are any ductwork issues, such as leaks or blockages, call a professional to resolve them. It basically drowns out a lot May 9, 2024 · Check Furnace Enclosure Noise Level. Blower Covers with Sound Attenuation Materials can reduce blower noise up to 10 dB (A). The next column is the diameter (in inch) for ROUND RIGID duct. I have a fairly loud humming sound when the ac is running coming from the furnace. 5 m/s (meter per second). Remove and replace the air vent Apr 1, 2024 · The table on the right (or below if you’re viewing on a phone) shows the return duct size for HVAC unit from 1. Replace the filter with a less restrictive one to do the trick. 2. Inside the mechanical closet, the HVAC unit is adjacent to the wall thats shared with the living room. To learn more about the HVAC Return system and our Sep 22, 2021 · Hearing loud sounds coming from the ductwork that connects to your home’s HVAC system is to be expected. When the HVAC is on, it is LOUD. This will cut down on air turbulence, reducing flutter (vibration of the fins) and the ringing or singing noise. The Cold Air return has been placed in the hallway ceiling. Issue 1: Blocked or obstructed vents. Also, improperly placed vents can affect how a building maintains its temperature. Jul 9, 2019 · The furnace is in the basement. Loud noises coming from your AC unit when it turns on can be caused by a variety of issues — electrical shortages, failing fan motors, broken fan blades, clogged filters, and more. The blower/furnace was directly on the other side of the return with the Feb 25, 2007 · My current one is 20x20. Blocked vents can hinder airflow and cause the system to run inefficiently. The intake in the master bedroom is connected directly to the return shaft - no duct between it and the shaft. Oct 27, 2023 · Install the Return Air Vent Cover. Oct 11, 2019 · Clunking and banging noises tend to occur when scale accumulates on the heat exchanger. Next, find an air vent and hold the piece of paper around six inches from it. One thing that might help with fan noise is to offset the filter from being in line with the motor shaft by extending the return air drop up to the ceiling and moving the return register/filter up to the top of the wall. The basement return vent is right in front of the furnace, and measures 10x20". It is roughly 6 feet from the hallway closet that houses the HVAC unit. Moving the unit also means adjusting the supply, potentially cutting and adjusting the refrigerant lines, modifying the electrical, etc etc. Suggest you temporarily block off the return at the ceiling, remove the fan compartment door and run blower to see if sound is still too loud or not. Before it gets this bad, ensure dust, dirt, and dander enter your ducts by cleaning the debris from all openings. No problem there. The return vents are fine on noise. In the master bedroom, there is one of four intake vents in the house, and this particular one is very loud. To resolve this problem, tape up the gaps with quality HVAC foil tape. Its pretty loud when the fan is running and has pretty good suction. It will likely be a small hole near where the duct connects with the furnace close to the blower. Here’s the proposal that we received to reduce the noise from the company that installed the HVAC: Install 1⁄2” sound liner insulation in 20x24 air filter return air plenum, 18x11 return air elbow and 20x10 duct to return grille. The first two pertain to standalone vents, whereas the remaining pertain to HVAC air vents. Feb 23, 2017 · Check the data tag on your furnace for the input rating. Sound and vibration is created by sources such as pumps and fans, which are then Dec 23, 2014 · If your furnace is fueled by oil or gas, a delayed ignition within the furnace may be causing unexpected furnace noise. Sealing gaps and cracks in the utility closet. When I close the vent enough to have heat levels acceptable, it is like trying to sleep in a whistling wind tunnel. Non-technical people and homeowners can HVAC Noise Reduction. Fixing the design problems can fix the perception problem, too, so let’s see what you need to do. Aug 15, 2023 · Adequate airflow capacity: The return air ducts should have sufficient capacity to handle the airflow volume of the hvac system. Noisy return vents are mainly the result of the blower being too close to the return grille. It sounds like a giant vaccum cleaner. Because of this, whenever the air kicks on it sounds like a wind tunnel in pretty much the whole apartment. And your flex sizes are too small for quiet operation also. Oct 21, 2021 · 2. If Jun 1, 2016 · I live in a 1 story home with a gas furnace installed in a closet in the center of the house and near the bedrooms. However, in many two-story homes – and in homes where the builder wanted to keep costs as low as possible – there’s just one return in the upstairs hallway. Secure the foam with metal wire to make sure the foam doesn’t get sucked into the blower. The sounds just carries through the return duct all the way to my return grille. Air pressure can also cause noise. Blower enclosures made of metal can cause more noise than plastic, fiberglass, or other materials. It's hard to tell from a video over the internet, but is your sound JUST airflow/wind noise or does it sound like a mechanical/vibration/humming noise as well. Because the ignition is delayed if the burners are covered in buildup, the high volume of gas that ignites creates a loud bang. Primary small one is the one upstairs. Noisy fan. Change 16" flex to 8"x 18" ductboard. Jun 6, 2016 · If necessary, you may need to contact an HVAC company with a 24-hour hotline. The upstairs return vent is directly above the basement vent, and measures 7x31'. Now, I’m not talking about the acoustic caulk you’d use to seal the cracks around your windows. ls ks qw tb hs ny lf eh oi jl