1-778-759-9864
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BCFurnace

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BCFURNACE

021-870

$117.00

+5% Tax • Shipping calculated at checkout.

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

Name

SWITCH DIFFERENTIAL PRESSURE -40 TO 15

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 differential air pressure switch is a vital safety component for HVAC systems and air handling units. Designed to function as an air proving switch, it monitors the pressure difference across blowers, filters, or coils to ensure proper airflow is maintained during operation. By detecting changes in air pressure within a range of -40 to 15, it prevents the system from running under unsafe or inefficient conditions, such as a blocked vent or a failing motor. This switch is a common replacement part for heating and cooling equipment that fails to trigger ignition or experiences frequent safety shutdowns due to airflow detection errors.

Specifications

Type
Air Pressure Switch / Air Proving Switch
Size
Small / Standard HVAC Control Component
Application
Used in commercial and residential air handling units (AHU), furnaces, and ventilation systems to monitor airflow and prove pressure differentials.
Specifications
Operating Range: -40 to 15; Function: Differential pressure sensing for air proving and safety interlock.

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 021-870 a genuine OEM part?
Yes, the 021-870 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 021-870 is compatible with my BCFurnace furnace?
The easiest way is to match the part number (021-870) 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 021-870 shipped?
Most Air Pressure Switches including the 021-870 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 021-870 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 021-870 is in stock before visiting.

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