Air King Heat Lamp and Exhaust Fan Combos

Air King’s combination heater/exhaust fans solve the cold bathroom problem without requiring separate units. These units combine a heat source (either infrared bulb or ceramic element) with a 70 CFM exhaust fan in a single ceiling-mounted fixture.

The real value? You’re getting supplemental heat and moisture control from one electrical connection. Perfect for Montana bathrooms where winter mornings hit hard and proper ventilation prevents ice dam damage.

Model Comparison: AK917 vs AK55L

The AK917 uses a 250-watt infrared heat lamp (Type R40, not included) that delivers 850 BTU of silent, focused warmth. It runs at 3.5 sones — quiet enough you won’t wake the house. Both models are IC-rated for direct contact with insulation up to R-40.

The AK55L takes a different approach with a 1350-watt ceramic heating element. That’s serious heat output — five times the wattage of the bulb heater. The trade-off? It runs louder at 5 sones. You also get a moonstone glass light lens with this model.

Specification	AK917	AK55L
Heat Type	250W infrared bulb	1350W ceramic element
Heat Output	850 BTU	Not specified
Airflow	70 CFM	70 CFM
Sound Level	3.5 sones	5 sones
Voltage	120V AC	120V
Current Draw	2.6 Amps	0.3A (fan only)
Duct Size	4-inch round	4-inch round
Insulation Rating	IC-rated to R-40	IC-rated

The AK917 makes sense for standard bathrooms where you want a quick heat boost without the noise. The ceramic AK55L delivers real heating power but you’ll hear it working. Both are rated for bathrooms up to 65 square feet.

Installation Requirements

These units require a 120V/15A circuit. Hard-wired connection only — no plug-in option. Both models include adjustable hanging brackets for ceiling mounting.

The 4-inch round duct connection is standard. A plastic damper prevents backdrafts. The fan, heat source, damper, and duct collar can be wired to operate independently if you run separate switches.

Key installation points:

• Minimum 4-inch clearance from combustible materials
• Cannot be installed inside showers or over tubs
• Not ENERGY STAR certified (typical for heat-lamp combo units)
• Wire the heat and fan functions separately for independent control

Cold Climate Performance

The AK917’s infrared heat lamp provides silent heating — crucial when you’re trying not to wake anyone at 5 AM. Infrared heat warms objects directly rather than heating air, so you feel the warmth immediately when you flip the switch.

Rated for bathrooms up to 65 square feet, these units handle typical residential bathrooms. The 70 CFM exhaust capacity clears moisture effectively — preventing condensation problems that lead to mold and rot in Montana’s climate.

The IC rating matters in Montana. With R-40 insulation contact allowed, you can bury these units in heavily insulated attics without creating a fire hazard. That’s essential when you’re packing R-49 to R-60 in the attic to prevent ice dams.

Bottom Line

Air King’s heater/fan combos deliver what Montana bathrooms need: supplemental heat and moisture control from a single fixture. The AK917 works for most applications — quiet operation and sufficient heat for morning comfort. The AK55L brings serious heating power if you need to actually warm the room, not just take the edge off.

Contractors appreciate these “little Air Kings” for their compact size and utility. At these price points, you’re getting basic functionality without bells and whistles. Perfect for rental properties, basement bathrooms, or anywhere you need affordable comfort without complexity.

FAQ

Do these units come with the heat lamp bulb? No, the 250W infrared heat lamp (R40 type) is not included with the AK917. You’ll need to purchase it separately.

Can these units be used in a shower area? No. These units cannot be installed inside showers or over tubs. They’re designed for general bathroom ceiling installation only.

How loud is 3.5 sones? The AK917 at 3.5 sones provides quiet operation — roughly equivalent to a modern refrigerator running. You’ll hear it, but it won’t dominate the room.

What’s the actual heat output difference between models? The AK917 uses a 250-watt heat lamp producing 850 BTU. The AK55L uses a 1350-watt ceramic element — over five times the wattage, though BTU output isn’t specified.

Does the ceramic heater model need special wiring? Both models run on standard 120V/15A circuits. However, the AK55L’s 1350W heater draws significant current — ensure your circuit can handle the combined load with other bathroom fixtures.