Pottorff introduced it’s first ceiling radiation damper in 1971, and the subsequent addition of fire-smoke dampers, air control products and louvers marked an important turning point in the success of the company.

• See also:
• Masterformat 2004
• 08 31 00 - Access Doors and Panels
• 08 31 13 - Access Doors and Frames
• 08 31 16 - Access Panels and Frames
• 23 30 00 - HVAC AIR DISTRIBUTION
• 23 33 00 - Air Duct Accessories
• 23 34 00 - HVAC Fans
• 23 34 13 - Axial HVAC Fans
• 23 34 16 - Centrifugal HVAC Fans
• 23 34 23 - HVAC Power Ventilators
• 23 34 33 - Air Curtains
• 23 35 13 - Sawdust Collection Systems
• 23 37 00 - Air Outlets and Inlets
• 23 37 13 - Diffusers, Registers, and Grilles
• 23 37 23 - HVAC Gravity Ventilators
• 23 38 13 - Commercial-Kitchen Hoods
• 23 40 00 - HVAC AIR CLEANING DEVICES
• 23 41 00 - Particulate Air Filtration
• 23 41 33 - High-Efficiency Particulate Filtration
• 23 41 43 - Ultra-Low Penetration Filtration
• 23 43 00 - Electronic Air Cleaners
• 23 82 00 - Convection Heating and Cooling Units
• 23 82 16 - Air Coils
• 23 82 19 - Fan Coil Units
• 23 82 23 - Unit Ventilators
• 23 82 26 - Induction Units
• 23 82 33 - Convectors
• 23 82 36 - Finned-Tube Radiation Heaters
• 23 82 39 - Unit Heaters
• 44 11 16 - Fugitive Dust Barrier Systems
• 44 13 00 - Gaseous Air Pollution Control Equipment
• Masterformat 1995
• 08310 - Access Doors and Panels
• 11425 - Hood and Ventilation Equipment
• 15760 - Terminal Heating and Cooling Units
• 15800 - Air Distribution
• 15820 - Duct Accessories
• 15830 - Fans
• 15850 - Air Outlets and Inlets
• 15860 - Air Cleaning Devices