Air Systems portable inline ventilation heater connects to any standard 8” flanged ventilation blower. Automatic start while blower is running with a built in safety pressure switch and automatic thermal shutdown at 170 degrees F. Model SVF-7KW-8 heater requires 230/1, 28 amp for operation and is rated at 23,900 BTU. Contact Air Systems Customer Service Department for more information 1-800-866-8100 or sales@airsystems.com