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Model 2200/2250 - Light Duty

Model 2300/2350 - Medium Duty (Standard)
Model 2400/2450 - Heavy DutyNon handedDouble actingCenter hung & offsetIdentified by # at opposite end of the closer from the shaftHold Open (HO) or No Hold Open (NHO) - 90 or 105 degree4-prong shaftDimensions: 15-1/2" x 4-1/4"

Model 22000/22500 - Light Duty

Model 23000/23500 - Medium Duty (Standard)
Model 24000/24500 - Heavy DutyNon handedDouble actingCenter hung & offsetIdentified by # at opposite end of the closer from the shaftHold Open (HO) or No Hold Open (NHO) - 90 or 105 degreeRectangle shaftDimensions: 15-1/2" x 4-1/4"