Bigfoot, not – welding fume extractors should be small and powerful

Recently a new customer told us he chose one of our most popular high-CFM units for his welding application because of its small footprint. (CFM is an airflow measurement expressed in cubic feet per minute.)

That got us to thinking. What does it mean when a welding fume extractor occupies 475% more space than our high-performing and compact Model 450?

Let’s start with obstruction

Big units obstruct big time. They obstruct light, they obstruct workers, they get in the way of other equipment.

Using a too-large fume extractor at a two-welder job is like having a third guy with a vacant look on his face, just standing around, taking up valuable real estate.

Some jobs have odd-shaped pieces that have to be clamped onto supports and onto each other in order to be welded. Having to make allowances for the bulk of a too-large fume extractor makes job set-up way too time consuming, never mind the actual welding.

In contrast, our Model 450 can be rolled UNDER the work bench while its flexible hose can be snaked OVER the bench to where the work’s going on. Not much obstructing going on in that scenario.

Some customers even cut a hole in the work bench for the 450’s flexible hose, making it easy to swivel the hose to wherever the torch is but keeping the cabinet under the bench.

True portability takes more than wheels

Big units are not only bulky, they weigh a lot, as much as 360 pounds.

Yeah, wheels help you move it around the shop, but how are you going to lift that monster into the back of your truck?

Once again, in contrast, let us point out that, depending on the filter array you stick in it, our Model 450 weighs no more than 112 pounds. You can get that into your truck.

Space, an old frontier that still needs settling

When your too-big fume extractor is not in operation, where can you stow it to keep it out of the way? Do you sometimes wish it had a garage of its own?

Visit the Model 450 web page for testimonials, video and brochures.

The Model 450 fits under workbenches, under office desks, even in your standard-sized supply closet. It is totally out of the way until a job comes in and you need to fire it up and go to work.

Good design, quality components

The space within a fume extractor cabinet can be expressed in cubic feet:

  • Too-large fume extractor: 29.3 cubic feet.
  • Sentry Air Model 450:
    9.2 cubic feet.



You should be asking yourself this:

Why does one manufacturer require 29.3 cubic feet of cabinet and components to produce 950 CFM while Sentry Air requires only 9.2 cubic feet of cabinet and components to produce airflow of 950 CFM?

Skillful design will do that for you. And Sentry Air fume extractors utilize skillful design.

The patented design of the Model 450 maximizes the unit’s functionality while constraining it to a small footprint. That doesn’t happen by accident.

In addition, we choose components of the highest quality. Some of our components have been in operational tests nonstop for years – yes, nonstop operation for years – without failing.

Give us a call

If good design pulls you like a magnet or you just want to get the welding smoke out of your face, give us a call at 1.800.799.4609, email us at, or fill out this online form to have a Sentry Air Systems Applications Specialist contact you.






Sentry Air Model 450 Fume Extractor Specifications

Cabinet Dimensions:

22.5″L x 20″W x 19.5″H

Arm Dimensions:

6″ Round x 72″ Long fire retardant flex hose


62 lbs to 112 lbs

Cabinet Material:

16 ga. carbon steel


1.5 Horsepower

Available Filter Efficiencies:

HEPA Filter – Up to 99.97% efficient on particles 0.3 microns and larger.
ASHRAE Filter – Up to 95% efficient on particles 0.5 microns and larger.
ULPA Filter – Up to 99.9995% efficient on particles 0.12 microns and larger.
Activated Carbon & Specialty-Blended Filters – Efficiency varies per chemical.

Air Volume:

Variable Speed Control Standard on 115
950 CFM High, Down to 50 CFM Low
On/Off Toggle Switch Standard on 220


115/1/60, 10.7 amps
220/1/50, 5.35 amps

Sound Level:

Approx. 72 dba @ 3′


Limited two-year warranty from date of shipment on defects due to materials or workmanship.

Patented Design:

U.S.PATENT #5,843,197
U.S. PATENT #8,353,745