We ship worldwide — Singapore, Australia, Malaysia, Indonesia, Philippines, India, Middle East & more

ALLEGRO Ambient Air Pump: 0 to 10 cfm, 0 to 15 psi, 3/4 hp Horsepower, OBAC, Allegro 9821 - Allegro SAR Compressors & Ambient Air Pumps
ALLEGROAllegro SAR Compressors & Ambient Air Pumps

ALLEGRO Ambient Air Pump: 0 to 10 cfm, 0 to 15 psi, 3/4 hp Horsepower, OBAC, Allegro 9821

The Allegro 9821 OBAC Ambient Air Pump delivers 0 to 10 cfm at 0 to 15 psi, powered by a 3/4 hp motor and equipped with OBAC fittings to support up to two respirators. 3G Electric interprets this demand and supplies…

SKU 3G-OTH-691949

Also listed as: 9821OBAC · 9821-OBAC

Brand
ALLEGRO
Item
Ambient Air Pump: 0 to 10 cfm, 0 to 15 psi, 3/4 hp Horsepower, OBAC, Allegro 9821
Category
Allegro SAR Compressors & Ambient Air Pumps
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support

Delivery
Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

ALLEGRO
Manufacturer Part Number
9821 OBAC
Type
0 to 15 psi, OBAC, Allegro 9821
Air Flow
0 to 10 cfm
Fittings
OBAC
Horsepower
3/4 hp
Respirators
2
Brand and Series
Allegro 9821
Operating Pressure
0 to 15 psi

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

ALLEGRO Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Allegro 9821 OBAC Ambient Air Pump delivers 0 to 10 cfm at 0 to 15 psi, powered by a 3/4 hp motor and equipped with OBAC fittings to support up to two respirators. 3G Electric interprets this demand and supplies the genuine Allegro SAR Compressors & Ambient Air Pumps across 14 industrial departments — with specialist depth in combustion, pumps and controls as an authorised distributor.

Frequently Asked Questions

What is the Allegro 9821 OBAC Ambient Air Pump used for?

The Allegro 9821 OBAC Ambient Air Pump supplies breathable air to up to two respirators in industrial environments. It is commonly used in painting, chemical handling, and confined-space operations where a continuous, clean air source is required for worker safety.

What are the specifications of the Allegro 9821 OBAC Ambient Air Pump?

The Allegro 9821 OBAC delivers 0 to 10 cfm air flow at 0 to 15 psi operating pressure, powered by a 3/4 hp motor. It features OBAC fittings and supports two respirators. The manufacturer part number is 9821 OBAC.

Where to buy the Allegro 9821 OBAC Ambient Air Pump worldwide?

3G Electric supplies the genuine Allegro 9821 OBAC Ambient Air Pump worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for a quote and lead time on this respirator air pump.

How to select the right ambient air pump for two respirators?

Select a pump that meets the combined air flow and pressure requirements of both respirators. The Allegro 9821 OBAC provides 0 to 10 cfm at 0 to 15 psi, sufficient for two units. Verify your respirator's NIOSH approval and fitting compatibility before ordering.

Used in

Common applications for ALLEGRO
Industrial hygiene monitoring — ALLEGRO lead cassettes (9804-14) for airborne lead sampling in manufacturing facilities.
Confined space ventilation — ALLEGRO axial blower (9548) for air movement in tanks or vaults during maintenance.
Temporary heating on construction sites — ALLEGRO portable electric heater (9401-50) for work tents in cold weather.
Sampling pump maintenance — ALLEGRO service kits (9804-40) for replacing vanes and filters in IAQ pumps.
Asbestos or particulate analysis — ALLEGRO TEM cassettes (9804-17) for electron microscopy sample collection.
HVACR system testing — ALLEGRO axial blower (9548) for ventilation testing in ductwork or equipment rooms.

ALLEGRO Products

3G Electric supplies ALLEGRO allegro sar compressors & ambient air pumps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Pump Accessories Valves & Regulation Motors & Drives All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
Replacement Exhaust Filter: Allegro (MPN 9700-02)
ALLEGRO
Replacement Exhaust Filter: Allegro (MPN 9700-02)
ARO Compressed Air Regulator: Aluminum, 1 1/2 in NPT, 2,000 cfm, 10 psi to 180 psi, Knob (MPN R47581-300)
ARO
ARO Compressed Air Regulator: Aluminum, 1 1/2 in NPT, 2,000 cfm, 10 psi to 180 psi, Knob (MPN R47581-300)
ARO Compressed Air Regulator: Aluminum, 1/4 in NPT, 86 cfm, 0 psi to 140 psi, Knob, 1500 Series (MPN R37221-100)
ARO
ARO Compressed Air Regulator: Aluminum, 1/4 in NPT, 86 cfm, 0 psi to 140 psi, Knob, 1500 Series (MPN R37221-100)
ARO Compressed Air Regulator: Aluminum, 1 in NPT, 400 cfm, 10 psi to 180 psi, T-Handle (MPN R47561-300)
ARO
ARO Compressed Air Regulator: Aluminum, 1 in NPT, 400 cfm, 10 psi to 180 psi, T-Handle (MPN R47561-300)
ARO Compressed Air Regulator: Aluminum, 2 in NPT, 2,000 cfm, 10 psi to 180 psi, Knob (MPN R47591-300)
ARO
ARO Compressed Air Regulator: Aluminum, 2 in NPT, 2,000 cfm, 10 psi to 180 psi, Knob (MPN R47591-300)
ARO Compressed Air Regulator: Aluminum, 1 1/2 in NPT, 2,000 cfm, 5 psi to 125 psi, Knob (MPN R47581-100)
ARO
ARO Compressed Air Regulator: Aluminum, 1 1/2 in NPT, 2,000 cfm, 5 psi to 125 psi, Knob (MPN R47581-100)

More from ALLEGRO

View all ALLEGRO parts
Ambient Air Pump: 0 to 10 cfm, 0 to 15 psi, 3/4 hp Horsepower, Schrader, Allegro 9821, 2 Respirators (MPN 9821 W/SCHRADER)
ALLEGRO
Ambient Air Pump: 0 to 10 cfm, 0 to 15 psi, 3/4 hp Horsepower, Schrader, Allegro 9821, 2 Respirators (MPN 9821 W/SCHRADER)
Ambient Air Pump: 0 to 10 cfm, 0 to 15 psi, 3/4 hp Horsepower, Industrial Interchange, Allegro 9821 (MPN 9821 IND. INTERCHANG)
ALLEGRO
Ambient Air Pump: 0 to 10 cfm, 0 to 15 psi, 3/4 hp Horsepower, Industrial Interchange, Allegro 9821 (MPN 9821 IND. INTERCHANG)
Ambient Air Pump: 0 to 10 cfm, 0 to 15 psi, 3/4 hp Horsepower, Hansen, Allegro 9821, 2 Respirators (MPN 9821 W/ 3/8 HANSEN)
ALLEGRO
Ambient Air Pump: 0 to 10 cfm, 0 to 15 psi, 3/4 hp Horsepower, Hansen, Allegro 9821, 2 Respirators (MPN 9821 W/ 3/8 HANSEN)
Ambient Air Pump: 0 to 20 cfm, 0 to 15 psi, 1 1/2 hp Horsepower, OBAC, Allegro 9832, 3 Respirators (MPN 9832 OBAC)
ALLEGRO
Ambient Air Pump: 0 to 20 cfm, 0 to 15 psi, 1 1/2 hp Horsepower, OBAC, Allegro 9832, 3 Respirators (MPN 9832 OBAC)
Ambient Air Pump: 0 to 5 cfm, 0 to 15 psi, 1/4 hp Horsepower, OBAC, Allegro 9806, 1 Respirators (MPN 9806 OBAC)
ALLEGRO
Ambient Air Pump: 0 to 5 cfm, 0 to 15 psi, 1/4 hp Horsepower, OBAC, Allegro 9806, 1 Respirators (MPN 9806 OBAC)
Replacement Inlet Filter: Allegro (MPN 9700-01)
ALLEGRO
Replacement Inlet Filter: Allegro (MPN 9700-01)
High Pressure Regulator: Allegro (MPN 9891-11)
ALLEGRO
High Pressure Regulator: Allegro (MPN 9891-11)
Service Kit: Allegro (MPN 9700-50)
ALLEGRO
Service Kit: Allegro (MPN 9700-50)