Common Return HVAC in Residential Home

[jar546]

I have been doing private insurance inspections for over 8 years now for many different insurance companies and none have ever asked for the ISO rating of a building department on their reports. Fire department ISO's are required on about 70.% of themI dropped from a 3 to a 4 because the state never went to the 2009 IRC because of sprinklers and no Wildland-Urban Interface code adopted.

The BCEGS program assigns each municipality a BCEGS grade of 1 (exemplary commitment to building code enforcement) to 10. ISO develops advisory rating credits that apply to ranges of BCEGS classifications (1-3, 4-7, 8-9, 10). ISO gives insurers BCEGS classifications, BCEGS advisory credits, and related underwriting information.

Basically there are only 4 different rating groups and they only apply to the homes that where constructed during the time period the rating group was assigned

http://www.isomitigation.com/bcegs/0000/bcegs0004.html#q5

I too have done private inspections for insurance companies and you are right, they never ask for the ISO rating. The reason is that they already have most of the country in their database so they don't need to ask us what they already know.

 

[Gregg Harris]

First there is this part for residential:Then there is this under the residential energy code:

When you start getting into the ACCA Manuals, they are full of other information and requirements.

For those AHJ's that say, well I can approve other heating and cooling methodologies, what methodology are you approving?

So if you don't dig into Manual J, S and D, you really have no idea what you should be approving or inspecting.

Manual J finds the building load

Manual S sizes the system

Manual D covers the duct system, materials, friction loss, etc.

Then once you get into return air you have other info and requirements like this:

Also a critical piece of the puzzle is Manual T.

Selecting the correct terminal do distribute the supply air into the occupied space proportionally and at the correct velocity to make the entire space comfortable without excess noise and drafts.