Reznor RPB-300 Make Up Air Unit.
Two Stage Natural Gas; Airflows from 2,465 to 6,300 CFM; Temperature rise from 34°F to 87°F. O/A & R/A dampers with filters, O/A hood, 24V Control Relays, 2 Stage Duct & Room Thermostats, and Rain Baffled Hood.
May be purchased with Evaporative Cooling Section: REC-60. [link]
May be purchased with Curb: 105218, no stock at this time.
Airflow may be adjusted to achieve desired temperature rise.
Temperature rise calculated at 5,000' elevation.