4� Stainless Steel Horizontal Vent Kits are designed to fit the MHU45, HSU45, MHU50, HSU50, MHU75, HSU75, MHU80 and HSU80 model unit heaters
Designed for horizontal installation only
Sealed, stainless steel ventilation is required for horizontal installation in both the United States and Canada
Mr. Heater�s stainless steel horizontal vent kit allows Category 3 Unit/Utility heaters to comply with both the Canadian Standard (S636) and the US Standard (UL1738)
Stainless steel venting is not required for vertical installation