Mr. Heater Big Maxx 80,000 - Horizontal Vent

[mod600]

I've been looking thru the posts on venting the Big Maxx/Hot Dawg/Modine style overhead garage heaters. I'm planning to vent it horizontally and I know it requires Category III stainless venting. Mine is a 80,000 btu unit, and requires 4".

Question is, should I go with single or double wall vent pipe? Any recommended sites to order from? In town I can only find 4" Cat III pipe in single wall.

Thanks!
mod600

 

[mod600]

anyone?

 

[Will S.]

Use 4" double-wall. It is available through HVAC supply houses, like R.E. Michael.

 

[cdsvt]

I used 4" single wall z-flex z-vent category iii from pex supply on my 50K big maxx for horizontal venting.

 

[RABRods]

I used HeatFab Double wall (HeatFab SC), I bought most of it from SDS Supply online, and then some from Ventingpipe.com

 

[mod600]

Thanks for the replies. Just trying to decide what the benefit is between Single and Double wall...

 

[2CRUZ]

I used double 4 in. double wall for my 100,000 btu Hotdog.