Note: A minimum of one one inch clearance on all three dimensions for metal is necessary for a proper fit.
A. Length
Measure any and all valves and pipes on both ends, add at least one inch.
B. Height
Measure from floor to top of your radiator or valves. Add at least one inch.
C. Depth
Measure from wall or baseboard to front of radiator. Be sure to measure both sides, add at least one inch to the deeper measurement.