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Steve I didn't say a duct run needed calcs I said, any addition, meaning an addition in living space to a single family dwelling. Then calcs will be required.
Had one recently prior to the B.O requiring the necessary paperwork. Bldg permit pulled in January for an addition to a home. Home originally built in early 60's with minimal insulation and single pane windows and on an uninsulated crawl. I go on a rough duct inspection and find the contractor added trunklines off the original to take care of a 1500 sq ft. addition. The original house was 1300 sq. ft. I check the furnace and find a 80,000 BTU counterflo that has a serial number indicating its 1 1/2 yrs old. Ask homeowner who installed and when. Same contractor doing the addition and I red tag it for non permit with all the extra fees on top. Also I required a Manual J calc and the contractor went nuts. Gave him the code section notice and the addition is now on a stop work order awaiting the calcs. He will comply or the homeowner will have to hire someone that will.
 
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Discussion starter · #24 ·
Vern you are correct about red tagging the furnace and requiring a permit but not about requiring a load calc.

A load calc is a useful tool for a contractor to use if he feels unsure about the load. It should not be a requirement. Since loads vary by weather and construction differences they are estimates only. Sorry but you can't hang your hat on an estimate.

It would be like me asking you what is 1+1 and if you said 2 without using a calculator I would slap you upside the head.....


 
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