Dimensions(L*W*H): 46: (21*46*47)" 
42: (19*42*43)" 
38: (16*38*38)"
Framing Dimensions(L*W*H): 46: (22*49*55)" 
42: (22*45*51)" 
36: (18*40*44)"
Fuel Type: Gas
Vent Type: Direct Vent
Vent Size: 5x8
Ignition Type: Electronic
Installation: Zero Clearance
Style: Linear
Vent Inner Diameter: 5"
Vent Outer Diameter: 8"
Weight: 46: 150 lbs
42: 130 lbs, 38: 110 lbs
BTU: 46": 40,000 BTU (Heats up to 1,300 sq. ft.)
42": 32,500 BTU (Heats up to 800 sq. ft.) 
38" :20,500 BTU (Heats up to 500 sq. ft.)
Blower: Yes