1-778-759-9864
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BCFurnace

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BCFURNACE

021-891

$60.00

+5% Tax • Shipping calculated at checkout.

U.S. Duties/Taxes, if applicable, may be due at time of delivery.

Name

SWITCH, PRESSURE

1units available

Pickup available at 75 Blue Mountain St #3

Usually ready in 24 hours

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Local Pickup

Not sure this fits your furnace? Call us — we're happy to help

Product Details

Description

This high-performance Air Pressure Switch is a vital safety and operational component designed for modern HVAC systems and air handlers. Often referred to as an air proving switch, its primary function is to monitor the pressure differential created by the blower motor. By verifying that adequate airflow is moving through the system before allowing the heating or cooling cycle to proceed, it protects critical internal components from overheating and ensures energy-efficient operation. If your climate control system is failing to start, cycling improperly, or displaying airflow-related error codes, replacing a faulty pressure switch is essential for restoring reliable performance and maintaining household safety.

Specifications

Type
Air Pressure Switch / Air Proving Switch
Size
Small
Application
Commonly used in residential and commercial HVAC units, multi-zone split systems, and air handling equipment to ensure proper blower motor function and airflow safety.
Specifications
Monitors air pressure differentials; air proving safety mechanism; electrical terminal connections for seamless system integration; durable housing for heat and vibration resistance.

Not sure this is the right part?

Our team is happy to help you verify compatibility before you order. We'll confirm it fits your specific furnace model.

1-778-759-9864

Mon–Sat 8AM–9PM PST · Or email parts@bcfurnace.com

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Frequently Asked Questions

Is the 021-891 a genuine OEM part?
Yes, the 021-891 is a genuine OEM replacement part manufactured by BCFurnace. We source all Air Pressure Switches from authorized distributors to ensure exact-fit compatibility. This Air Pressure Switches is backed by our 100% compatibility guarantee — if it doesn't fit your furnace, we'll make it right.
How do I know if the 021-891 is compatible with my BCFurnace furnace?
The easiest way is to match the part number (021-891) with your furnace model number. Visit the BCFurnace page on our site and enter your model number in the search bar — our system will show all compatible Air Pressure Switches for your specific unit. You can also call our technicians at 1-778-759-9864 for free compatibility verification.
How fast can I get the 021-891 shipped?
Most Air Pressure Switches including the 021-891 ship within 1–2 business days from our warehouse. We ship across Canada and the United States with tracking on every order. For urgent BCFurnace repairs, contact us at 1-778-759-9864 for expedited shipping options.
Can I pick up the 021-891 at your store?
Yes! Local pickup is available at our Coquitlam, BC location: 75 Blue Mountain St #3. Air Pressure Switches orders are usually ready within 24 hours. Call us at 1-778-759-9864 to confirm the 021-891 is in stock before visiting.

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