Wow! I'm almost tempted not to reply to this...but maybe if you can answer some questions. Is this a patio stove or will it be inside? DO NOT use a unit like this inside your house or on a combustible floor. Back to the patio unit on a cement patio: line the firebox with traditional firebrick, not the red building bricks. Masonry stores usually offer a fire resistant mortar. Do not use regular portland mortar unless you plan on rebuilding the firebox every few years. Your vent should extend to a height of 12' above the top of the firebox, with an additional 12" to 18" for every 1000' of elevation at your location. Additionally extend the vent two feet higher than combustibles within ten feet, and three feet higher if you have a penetration through a flat roof. Under no circumstance should you use aluminum or zinc coated (galvanized) pipe for vent. Depending on surrounding structures, use only black or stainless steel connectors and UL listed insulated (triple wall or solid pack) chimney systems. Jerry rigged insulation in your chimney is a quick way to disaster. And, just out of curiosity, what does your boss do that makes him willing to accept the responsibility for your damaged house or lost loved one by "approving" the unit? Amazing.