Does anyone know what material I should use for an outside air kit?  The manufacturer does not provide any specifications.

I picked the official adapter for my stove which is a Regency H200.  The "intake" on the adapter is 3.75" outer diameter.
Maybe they are expecting you to use 4" flex pipe with a band clamp.

VT code says:
Must be constructed of noncombustible, corrosion-resistant material, with a minimum 1-inch clearance to combustibles for all parts of the duct within 5 feet of the firebox.

Hard aluminum flex duct with band clamp is what I did. Great website would be www.hearth.com and a search under OAK to see what some others have done.

Would this work?
http://www.supplyhouse.com/Z-FLEX-1TLXXXX0410-4-x-10-Ft-Triple-Lock-Aluminum-Flex-Duct

I'd skip outside air if the manufacturer says it is optional. YMMV.

Exception: Factory-built fireplaces, masonry fireplaces, and solid-fuel-burning appliances
that list exterior air supply ducts as optional or required for proper installation are permitted
to be installed with those exterior air supply ducts according to the manufacturer’s installation
instructions.

How come you would skip it?

The manufacturer only says it is required for mobile homes.


The VT code exception is poorly worded. The way that I read the exception is not that the outside air isn't required, but that you can install the combustion air in accordance with the manufacturer's installation specifications rather than VT RBES specifications. But that might not be correct.

I think you found , but are on page 34 here:
http://publicservice.vermont.gov/sites/psd/files/Topics/Energy_Efficiency/RBES/2015%20RBES%20Handbook.pdf

In reality, it is code for new homes, but there is no enforcement.

However, Efficiency Vermont would like me to certify my home as "Energy Star" (might help with resale, if it comes to that) and they give me a little money to do so, and the outside air is the only thing I am missing to complete that certification.

I don't have a vented clothes dryer but we do have 3 powerful bath fans and a range hood.  It's possible they would all be running at once and could prevent a good draft.

I wasn't thrilled about installing it which is why I pushed it off for so long.  My plan was to crack the window nearest to the wood stove , if we happen to have a full house of people   running bath and stove fans while also burning the wood stove.

More typical operation in the house would be running no fans other than the HRV  so it would be pretty balanced except for the wood stove.  On that note, wouldn't the wood stove create an imbalance with the HRV?

I've never used the stove so I am not sure how it works currently.

The house blew 1.25 ACH50 although there's a few more leaks to fix up.

There are other topics about the details of why it isn't very important and tradeoffs (some of which are dependent on the design and the situation). All considered, it never looked worth it to me - and most codes seem to reflect that it isn't always the best choice. Agreed, the VT code wording is unclear.

But if they give you money and a rating or you are experiencing draft problems - sure.