This 4 In. vertical ventilation kit can be used with the Heatstar or Big Maxx Indirect Fired Unit Heater for vertical venting. Designed to fit the MHU75, HSU75, MHU80 and HSU80 model unit heaters. Designed for vertical installation only. Allows Category 1 unit/utility heaters to comply to both the Canadian Standard S605 and the US standard UL441. Includes (1) 3 In. to 4 In. adapter, (1) 4 In. x 36 In. B-vent pipe, (1) 4 In. 90 Deg (degree) elbow, roof flashing, storm collar, vent cap, gas vent firestop spacer.
