Various jurisdictions in the US have different regulations. I'm guessing this is to prevent backdrafting into windows. IMHO, it would make more sense to limit the distance to openable windows, like gas appliance venting is.laurentbm wrote: ↑ Is your exhaust at ground level, or did they make a stack go up over the roof line? From what I've been seeing, they frequently do the former in Canada, but I believe the latter is EPA regulation / code in the United States. Just curious. Flirting with the idea of installing my own mitigation system.
I vented mine at about 18 inches ground level. My reasoning is, there is a huge amount of moisture being pulled out with the air. All that moisture going 30' up a pipe in winter is going to frost up on the inside of the pipe. When the temperature goes above freezing, all that water is going to back flow down the pipe. If your pipe is sloped upwards, the fan is going to be flooded. The fans explicitly state they are not designed to handle liquid.
Last winter during an extended deep freeze period, there was a massive frost build up in the area around my exit pipe. Unfotunately I have no images of that.
Because a large section of my venting runs through my cold cellar, which can drop to freezing, I put a bypass at my fan. Here's the link to the post I made. Your text to link here...
Some US rules state that the fan must also be located outdoors. Again. IMHO, that's a death sentence in -25C.