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Galvanized steel automatic crawl space fan with aluminum frame, 15 inch cut-out width

Tjernlund Products, Inc.

Tjernlund Products, Inc. Crawl Space Fan 220 cfm Automatic

SKU CH-4S0B-NNZQD

Automatic crawl-space ventilator moves 220 cfm and includes a built-in thermostat and dehumidistat for moisture control

  • Product weight7.31
  • Product typeAutomatic Plug-in
  • Main materialGalvanized steel
  • Automatic operation with built-in thermostat and dehumidistat
  • 220 cfm airflow for effective crawl space ventilation
  • Galvanized steel housing resists corrosion in damp conditions
  • Fits 15 in by 6 in cut-out for standard installation
  • Weighs 7.31 lbs for straightforward mounting

Automatic crawl-space ventilation

The Tjernlund Crawl Space Fan is an automatic plug-in unit designed to move 220 cfm of air through a cut-out measuring 15 inches wide by 6 inches high. It is intended for homeowners or contractors who need continuous moisture control in enclosed foundation areas without manual operation.

Included dehumidistat and thermostat

The bundled dehumidistat and thermostat automate fan activation based on humidity and temperature thresholds, removing the need for a separate controller. A power cord is also supplied so the unit can be plugged directly into an available outlet.

Straightforward wall or joist mounting

The galvanized steel housing fits the specified cut-out and weighs 7.31 units, allowing one person to position and secure it with basic tools. The main installation issue occurs when the existing opening does not match the 15 by 6 inch dimensions, requiring framing adjustments before the fan can be seated.

How it compares

Measured against everything we stock in Indoor & Outdoor Ceiling Fans, at today’s prices. Recalculated every night.

Price $138.99
Pricier than about 63% of the 444 comparable items (median $99.99).

Specifications

Product
Brand nameTjernlund
Product typeAutomatic Plug-in
Size & build
Main materialGalvanized steel

Questions about this item

Will the galvanized steel housing need any treatment to resist corrosion over time?

The housing is finished in galvanized steel, which provides a protective zinc coating that resists rust without further treatment under normal conditions.

At 220 cfm, what limits continuous airflow in a sealed crawl space?

The 6-inch by 15-inch cut-out size sets the maximum opening for air exchange, so the building envelope becomes the limiting factor before the fan motor does.

How much heat does the motor add when the fan runs all day?

The unit weighs 7.31 pounds and uses a shaded-pole motor typical for this airflow class; it adds only a few watts of waste heat to the space during continuous operation.

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