8HeaterModelNumberFloor BasePartNumber0133 0017490182/0181 0583130260/0261 0583140330/0331 0583150400/0401 0583160514 0561990624 0562000724 0562010824 0562020926* 0545971083* 0545981178* 0545991287* 0546001414* 0546011571* 0583781758* 0583790962 0592331125 0592341223 0592351336 0592361468 0592371631 0592381826 059239*Models with factory installed floorshield as standard.BOLD TYPE indicates Low NOx models.Table B: Combustible Floorshield Ordering InformationFig. 2: Alternate Method for Providing a Non-Combustible BaseClearancesInstallation Clearances(All Dimensions are in Inches)0133 0181 to 0514 to 0926 to 2100 toLocation 0401 0824 1826 4001FloorFrontBack 12 12 12 24 24Right 6 12 6 24 24Left 12 12 18 24 24*Vent 6 6 6 6 6Indoor Top 42 39 36 24 24Outdoor Top NASee Note 1See Note 2UnobstructedHeater SizeTable C: Clearances From Combustible SurfacesNote 1: Combustible floor shield is required when heater is to beinstalled on a combustible surface. (See ordering info.)Note 2: Servicing Clearances: Provide at least 24" (Models 0133-1826), 48" (Models 2100-4001) in front of unit for removal &servicing of the Controls & Burner Tray. Provide at least 18" on sideopposite water connections for deliming of Heat Exchanger Tubes.*Vent includes factory supplied drafthoods and does not include fieldsupplied vent systems above the drafthood. On Models 2100-4001drafthood is built into heater.Heater Size0133 0181 to 0514 to 0926 to 2100 toDescription Location 0401 0824 1826 4001a. 3-1/2 in. thick masonry walls Back 9 9 9 16 16without ventilated air space. Right 5 9 5 16 16Left 9 9 12 16 16Vent 5 5 5 5 5Indoor Top 43 39 36 24 24Outdoor Top Unobstructed NAb. 1/2 in. insulation board Back 6 6 6 12 12over 1 in. glass fiber or Right 3 6 3 12 12mineral wool batts. Left 6 6 9 12 12Vent 3 3 3 3 3Indoor Top 30 30 24 16 16Outdoor Top Unobstructed NAc. 0.024 sheet metal over 1 in. Back 4 4 4 8 8glass fiber or mineral wool Right 3 4 3 8 8batts reinforced with wire Left 4 4 6 8 8on rear face with ventilated Vent 3 3 3 3 3air space. Indoor Top 24 24 18 12 12Outdoor Top Unobstructed NAd. 3-1/2 in. thick masonry wall Back 6 6 6 8 8with ventilated air space. Right 6 6 6 8 8Left 6 6 6 8 8Vent 6 6 6 6 6Indoor Top 42 39 36 24 24Outdoor Top NA Unobstructed NAe. 0.024 sheet metal with Back 4 4 4 8 8ventilated air space. Right 2 4 2 8 8Left 4 4 6 8 8Vent 2 2 2 2 2Indoor Top 24 24 18 12 12Outdoor Top Unobstructed NAf. 1/2 in. thick insulation Back 4 4 4 8 8board with ventilated Right 3 4 3 8 8air space. Left 4 4 6 8 8Vent 3 3 3 3 3Indoor Top 24 24 18 12 12Outdoor Top NA Unobstructed NAg. 0.024 sheet metal with Back 4 4 4 8 8ventilated air space over Right 3 4 3 8 80.024 sheet metal with Left 4 4 6 8 8ventilated air space. Vent 3 3 3 3 3Indoor Top 24 24 18 12 12Outdoor Top Unobstructed NAh. 1 in. glass fiber or mineral Back 4 4 4 8 8wool batts sandwiched Right 3 4 3 8 8between two sheets 0.024 Left 4 4 6 8 8sheet metal with ventilated Vent 3 3 3 3 3air space. Indoor Top 24 24 18 12 12Outdoor Top NA Unobstructed NATable D: Clearances to Protected Surfaces