Brian Allen wrote:I have a 42' x 60' steel shop with 1.5" of closed-cell spray foam insulation on all walls and ceiling. I'd like to build a RMH (probably 8") to heat it and am getting the general design together.
The other option is a dedicated air intake, but that would mean a separate 15 foot run of pipe up the wall. The RMH burn chamber will be 12 feet from the side of the building (see the attached image) and about 20 feet from the front of the building, so the only real way to get combustion air in (that I'm aware of) is through a vertical pipe, like the chimney.
Despite the fact that it is enshrined in some building codes and its adherents are often vocally forceful, there is no scientific evidence to suggest that outdoor air supplies, either direct to the combustion chamber or indirect supplies to the living space, are reliable and effective remedial measures for combustion spillage from the appliance for which the supply is intended.
Jean-Paul Calderone wrote:How tight is your steel shop?
Jean-Paul Calderone wrote:What's your motivation for providing a dedicated air supply for the RMH?
Graham Chiu wrote:https://woodheat.org/the-outdoor-air-myth-exposed.html