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duct sizing
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  1. HVAC
    I am part way through a renovation. We have moved a number of walls, re-organized the plumbing, electrical, etc.. The reality of our house is very different from what it used to be, and I am trying to size the return and supply ducts properly to each of the sections of my house. I'm looking for...
  2. HVAC
    Hi all, first time posting. I'll do my best with this. I am in the process of dealing with a bunch of old ductwork from a rental property because it's wrapped in what is probably asbestos containing material. Long story short, the ducts have to go with the insulation and we're still...
  3. HVAC
    I am replacing an old noisy bathroom exhaust fan that currently has a 4" roof jack/cap and 4" ductwork. According to the proper calculations, I would need a new exhaust fan rated at 190 CFM. However, I can't find any 4" exhaust fans with CFM ratings this high. The roof is 7/12 pitch and I...
  4. HVAC
    Background: I recently bought a Fantech 3005R Heat Recovery Ventilator (HRV). I also purchased the ACCA Manual D book, so I could perform the duct sizing myself. The following calculations are just for the fresh air supply into the house. The Fantech has EBM fans(which I believe are ECM), and...
  5. HVAC
    I Am installing an Goodman 69k btu furnace in my home, I am wondering what would be the standard return air requirements, I will be cutting out the sill plate and floor on a partition wall i am not sure if one stud span will be enough. I will be using a regular filter. Thank You very much for...
  6. HVAC
    Hi, I have an old furnace in a lake house (~30 years old single wide mobile home) that I frequently use about once a month. The existing furnace is too old and has to go. Window AC are used during summer. I purchased a used Package unit (Carrier 48SS-042 -LP furnace and 3.5 tons AC.) I...
  7. HVAC
    I am replacing a 50+ year old Natural Gas forced air furnace with a new 90+ efficiency "Hamilton" single stage forced air furnace model # WUN-100-4C. Both old and new furnaces are 100K BTU. The new furnace outlet is the same size as the old, (19 3/4w x 20d) as is the plenum. The installation...
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