Need advice on range fan venting

3 years ago

I hope someone can advise me on the venting for our range fan. The range is going in between the windows with a fan box above. It was to have vented through the ceiling directly above the range. The HVAC installers used old plans and had it going up to the left side of the photo and through the ceiling there. We asked for it to be moved to between the windows, which they did, but they had it exiting through the wall there vs the roof. That exterior wall faces to the front of the house, so it’s not ideal cosmetically. We asked our general contractor to have the HVAC installers go through the ceiling as agreed and when we went over to look today see that the wall hole was covered and it was rerouted back to the original roof hole. Is that long vent pipe okay? We are installing a strong fan system (35” Faber Inca SD), but it was not at all what I had pictured. The manufacturer specs show short direct venting above or behind, not long runs of vent pipe and then a bend. Should we ask for it to be redone, again? Thanks!

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Comments (3)

worthy
3 years ago
last modified: 3 years ago
See here for the exact exhaust specs for your Inca model.

Unless your home is a flat roofed bungalow, you're likely at the limit of effective exhaust already. If your fan has more than 300 cfm flow, you should also likely provide for a makeup air supply.
pittsburrito
3 years ago
last modified: 3 years ago
The duct diameter looks too small, but it's difficult to tell in that photo. Make sure they used 6" duct, which the hood you selected calls for. (Transitioning from 6" at the hood to 4" ductwork is NOT what you want.)

https://www.faberonline.com/wp-content/uploads/2019/08/Inca-SD-spec.pdf

I'll let the ventilation math gurus here explain exactly how compromised the hood's effectiveness will be using the current path (with two 90-degree turns and some length), compared to a much shorter & straight vertical duct. (As it WILL compromise its effectiveness.)

Are you okay with the vent pipe coming through the roof on the front of your house? Is the place on the roof it is currently exiting in front of, or behind, the roof's ridge? If it is already coming through the front side of the roof anyway, I'd definitely have them move it, so it can be more effectively run.
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Shelley
Original Author
3 years ago
Worthy - it is not flat roofed but is a ranch with tall ceilings. I’ve sent the info you linked to our builder.

Pittsburrito - I was afraid of that. The bends in the ductwork coupled with the long run are what made me nervous. I’ll send along your comments and the link to our builder.

Thanks to you both. I needed to know I wasn’t worrying over nothing. Much appreciated!