For the kitchen be specific no combustibles within x feet, can't block stove.  

Plus work orders for break down/clean boilers, trap combustion duct changes, and a new chimney liner, at $5950 for all. 

Hydrogen can go through the same distribution system and adapted combustible engine systems.  

A NOTE ABOUT 90% FURNACES IN UNCONDITIONED ATTICSThe cost savings on the standard 80%s were NOT the only reason we installed a 80% in the attic.   90% Furnaces produce WATER during combustion which must be dealt with, i.e. pumped out on condensate lines.  

You just need to vent the exhaust air outside, and maybe bring in some make up air or bring in combustion air actually. 

There will be no storage of combustible or hazardous materials.

Duct systems, piping systems, flues, combustion air inlets and maintenance can be much more important than furnace brand.

Fire safety includes storage of combustibles, all tenants ability to access exits (including the offenders).

Combustibles need to be kept away from the temp heat.  

When I hear "lacquering in the garage," I think of a pile of combustible rags used for staining and cleaning all thrown together in a trashcan.