Tjernlund PAI-7 Combustion Air In-Forcer

The Tjernlund PAI-7 Combustion Air In-Forcer provides reliable combustion air for commercial heating equipment. For gas draft hood configurations it delivers up to 2,100,000 BTU/hour; for fan-assisted/power burner setups up to 3,700,000 BTU/hour; and for oil-fired flame retention up to 3,700,000 BTU/hour. With an air flow of 1,175 CFM, this unit ensures steady draft, improved burner efficiency, and safer operation across demanding commercial environments. Its compact footprint—32 inches long, 16-5/8 inches wide, and 18 inches high—mounts easily via an integral bracket on walls or roofs, simplifying installation and service. The PAI-7 is designed for commercial applications and ships with essential components to expedite setup, including a fan proving pressure switch and an outdoor air pre-filter for clean intake.

• 2,100,000 BTU/hour capacity (Gas Draft Hood)
• 3,700,000 BTU/hour capacity (Fan Assisted/Power Burner)
• 3,700,000 BTU/hour capacity (Oil Fired Flame Retention)
• Air flow rating: 1,175 CFM
• Size: 32" L x 16-5/8" W x 18" H
• Mounting: Integral bracket for wall or roof installation
• Application: Commercial environments
• Includes: Fan proving pressure switch
• Includes: Outdoor air pre-filter