first off,lighting a fire in august is not going to create much of a draft,see how it behaves when temp drops
This ^ ^ ^-As for the outside air temperature, this fireplace did the same thing all winter (it was actually in winter we used it for the first time and discovered the problem, and we have very cold winters here in Canada).
Long post, but it was mentionedI don't see anyone mention a fan on top of the chimney to help with draft: https://www.rockfordchimneysupply.com/products/auto-draft-chimney-top-ventilator
-I did ask about adding a fan to the top of the chimney to help with the draw, and was told that it would be against code in our area.
The Biltmore is sold as an open fireplace. Glass doors are an option. In the picture, it looks like the fireplace does not have glass doors, just a fire screen. The fireplace would work fine as long as there is sufficient room air for combustion. This is what is being achieved by opening a nearby window a little.if the combustion air pipe were closed it wouldn't work even with the window open, the fire would die, you have to close the other pipe from the outside, the one that reduces the draft or add other pipes to extend the flue upwards but I don't think is the case
The wording says reduce, not solve all situations. Indeed, there may be a fault in the OAK system or it may be with the ERV and outside of the 4" air supply's ability to remedy. Steps to isolate the cause have been mentioned in this thread.
The annular space. It's not required in the US. This fireplace uses Majestic SL1100 series 12" wood burning chimney pipe, 11" inner, 13" outer. In the US, the start collar has holes all around to cool the chimney pipe. In Canada, they require an outside air connection to feed those holes. It's just a box plenum with an outside air connection that surrounds the chimney start collar. I guess the concern is that the chase might be made airtight, causing insufficient cooling. I don't think this is related to the problem.I'm also confused about the function of the chimney air kit. Does it introduce air into the flue or into the annular space between the walls of the chimney pipe? Either way, it would have the effect of reducing the draft by cooling the chimney.