They are like a butterfly valve in the duct. Check for leaks first. Also check if they where added later and the unit can handle the amount of outlets in your house.
In the basement we found polystyrene insulation in between the Heating duct and the joists; Is that OK? What material we can use for that and what we cannot use?
The duct work in our basement is clicking and banging. Would insulating the duct work help cut down on noise? Or any ideas on how we can stop this noise?
The noise is driving us crazy! I can get to some places but the duct work is butted up against the main carrying beam and that side would not be covered. Is this a problem? I live in a condo, we are having remediation done to our HVAC units.
I had mine done approximately 6 years ago. Fiberglass with a covering over it. Danny, I live in the state of Maryland and my question to you goes as follows.
And why. Please advise thank you much. I own a built home and an attic furnace. I need a price to reinsulate the attic ducts. Question, should they have insulated wrapped on both the plenum and the cold air return for each and does it really work. What kind of insulation wrap would you suggest. I have lived with it this way for 15 years not really knowIng about this issue. Is it appropriate for a consultant to check Insulation of duct by cutting duct wrap 1 ft square.
After removing a piece of drywall in my laundry room, I discovered that the previous homeowner had installed fiberglass installation underneath a heat vent duct? He installed with the paper side touching the metal duct.
Is this dangerous? Is this safe? Hi, Kay! What a great question! I have a single level home with big open attic it has blown insulation and very narrow crawl space but my furnace electric has the single return air duct running about 4 feet from furnace it is in lowered ceiling from bathroom to kitchen ,, my question is can I use a flexible hvac pipe duct an d run a network to living room and two bedrooms the way it is now is very in sufficient, furnace runs almost constantly in cold months , I would appreciate your professional opinion and tips what to do thanks.
Hi, Bill, Great question! I live on a 3rd floor condo with forced air heating. I have accordion style vents in the attic. Would insulating them help the situation? Furnace and ac units are brand new and appropriate for the unit size. Hi, Kenneth, Great question! He will contact you soon to discuss featuring it during an upcoming show. Take care! A part of me has to wonder how the cost-benefit breaks down when buying pre-insulated piping. If you want to know the details about duct insulations, see my post on the 4 common types of duct insulations.
Many people, including myself last time, have a hard time figuring out what is the necessary duct insulation thickness. Although there are some standards that require much thicker duct insulation to conserve energy, most people insulate ducts to prevent condensation. To prevent condensation on ducts, the external surface temperature of the duct must not approach and fall beyond the dew point of the air.
Hence, the dew point of air is not a constant and it is depending on temperature and relative humidity. In other words, it is geographical location-dependent. When calculating the dew point, we should use the initial temperature and relative humidity values and not the desired room conditions value because condensation can happen right after you switch on the air conditioner. The best is to target the external duct surface temperature at around 3.
After finding the dew point, we need to estimate the supply air temperature inside the duct. Otherwise, your house may be too humid and it may be a sign of oversized air conditioners or other problems. For concealed ducts such as above the ceiling and inside the wall, find the duct insulation thickness based on the temperature difference between the dew point and the supply air temperature using the below table:.
Most duct insulations have a K value of 0. For instance, 0. However, some insulations are specified in R value and many people have a better understanding when buying insulations based on R value. To convert the K value into R value, divide 1 by K value. For example, 1 divided by 0. In other words, R value is dependent on the thickness and the thermal conductivity of the insulation.
Many houses in the United States are using R-8 duct insulations. However, if the duct insulations have only 0. In terms of SI unit, the K value 0. At 25mm, the K value is 0. So, to convert the K value into RSI value, divide 1 by 1. So, RSI 0.
However, most ducts located on the attic above the insulated ceiling should use R-6 insulation. Many people were misled by the R value stated by insulation sellers. There are several duct insulations sold on Amazon that claimed to be R-8 insulations. Even John Manville datasheet shows a maximum of 0.
To avoid you buying the wrong duct insulation, I recommend you get this fiberglass insulation if you plan to buy it on Amazon. Before you proceed to stick the fiberglass insulation on your ducts, it is very important that you understand the characteristic of insulations in general.
The thermal conductivity or insulating capability of insulations is dependent on their final thickness after installation. Furthermore, you must not allow air to stay in between insulations and ducts.
You need to gently press the insulations onto the external surface of your ducts in all directions. Typically, we apply dedicated insulation glues or adhesives on both the insulations and the ducts before we gently press insulations against ducts.
When there is air stuck in between insulations and ducts, the air will condense into water droplets and wet the insulations which reduce the thickness of the insulations thereby reducing the performance of the insulations.
Thirdly, you should wipe your ducts with wet towels to ensure there is no dust and dirt stays on the surface of the ducts before putting on the insulation so that the insulations will stick onto the ducts. If there are leftover insulations on the duct surfaces, scrub them off. The above three things are essentials and basics when insulating ducts, pipes and almost everything.
Measure the circumference of your duct. For rectangular ducts, simply add the width and height and then, multiply it by 2. For round ducts, measure the diameter, divide it by two and multiply it by 6.
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