Fireplace Vent Distance from Deck

Question by Dariusz Rudnicki

We have a wood deck installed and are attempting to pass final inspection. We failed b/c the inspector said the deck must be 12″ away from the vent termination for our gas fireplace. The deck is not over the vent, it is next to it (not touching) The inspector has said we have 8 1/2″ clearance.

Our fireplace is a Heatilator ND3933. The manual seems pretty clear to me – that the vertical clearance required is 12″ if the vent is UNDER a deck. It doesn’t specify a horizontal clearance.

Any idea if the inspector is right? Our neighbors deck is positioned the same as ours. They have a metal plate attached to the deck where the vent is the closest. I have searched online trying to find a similar product but haven’t had any luck. Do you know of any kind of heat deflector or shield that could be used?

We really don’t want to have to bring the deck in 4″ if it’s not necessary.

Thanks for your help!

1 Answers
Dariusz Rudnicki Staff answered 12 months ago

If you look at the page #23 of the installation manual (http://www.heatilator.com/downloads/installManuals/4055_187.PDF), item “A” states: Clearance above the ground, a veranda, porch, deck or balcony – 12 in. (30 cm) minimum. *. This is probably what your inspector has been referring to.

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