The published numbers, side by side
Every figure in this table is the maker’s own, read on their product page. Where a brand publishes nothing, the cell says so rather than borrowing a reseller’s number.
| | Adam’s Air Cannon | MetroVac Master Blaster MB-3CD |
|---|
| Airflow (volume) | 392 CFM | 227 CFM |
| Air speed | Over 73,200 FPM (over 200 MPH) | 58,500 FPM |
| Motor | 3.2 HP, dual 800 W, adjustable speed | Two 4.0 peak HP twin fan motors, 120 V |
| Power draw | Requires a 20-amp circuit | 2,160 W / 18 A |
| Heated air | Heated in under 30 seconds | Not published |
| Filtration | Removable, cleanable filter cover | Not published |
| Hose | Self-expanding 30 ft | 10 ft commercial |
| Cord | 15 ft | 12 ft grounded 3-conductor |
| Weight | Not published | 17 lbs |
| Noise | 84 dB | Not published |
| Warranty | 1 year against manufacturer defects | 5-year limited on unit and motor; 1 year on parts, switches, cords |
| Accessories | Rubberized fan tip and pointed tip | Crevice tool, 1.5 in neoprene nozzle, air flare, inflator adapter, hose adapter |
CFM dries panels. FPM clears gaps. They are different jobs.
This is the one piece of theory worth having before you read any dryer spec sheet, because the two machines sit on opposite sides of it.
CFM— cubic feet per minute — is the volume of air moved. Volume is what pushes a whole sheet of water off a hood or a door in one pass, which is why it is the number that decides how fast you get around a car. Adam’s publishes 392 CFM, 73% more than the Master Blaster’s 227.
FPM— feet per minute — is how fast that air is travelling at the nozzle. Speed is what reaches intosomething: a mirror housing, a lug-nut recess, a badge, a grille slat, a door shut. Here the figures are closer than the marketing suggests — 73,200 FPM against 58,500 — but the Master Blaster is pushing its stream through an all-steel body and a shorter, stiffer commercial hose, which is part of why it has the reputation it has for clearing trapped water out of a truck.
In practice the two numbers trade against each other at a given motor size, and the honest summary is that Adam’s wins the panel-drying race while MetroVac is built for the fiddly, water-trapping parts of big vehicles. If you want the full ranking across the whole category rather than just these two, that is our car dryer and blower roundup.
Four questions that actually decide this
1. What is on your garage circuit?
Start here, not with CFM. Adam’s states outright that the Air Cannon “Requires 20 AMP Circuit”. MetroVac publishes 18 amps and 2,160 watts for the Master Blaster — above the 80% continuous load a 15-amp circuit is designed for. A detached garage, an outdoor GFCI outlet, or a 15-amp breaker shared with the lighting will trip, and running either unit on a long, thin extension cord makes that worse.
If that describes your setup, buy the MetroVac Sidekickinstead: 960 watts and 8 amps runs on any household outlet, and the 25-foot cord version reaches further than either canister’s cord. You give up the volume to dry whole panels, which is a real loss — see the next question.
2. Do you want to stop touching the paint, or just finish the job?
These are two different purchases that look like one.
If the point is touch-free drying— nothing contacts the clear coat at all, because contact is where swirl markscome from — you need volume, and you need it over a whole car before the water starts drying on its own. That is the Air Cannon’s case, and Adam’s makes it plainly: it calls the unit “The safest touch-free drying method available”.
If the point is to chase trapped water out of trim and wheels after you have already towel-dried the panels — so it does not run out in streaks ten minutes later — you do not need a canister at all. A 3-pound handheld does that for a fraction of the money. Our guide to drying a car without scratching it covers the hybrid routine most people land on: a plush drying towel on the flat panels, air for everything the towel cannot reach.
3. How often will it run, and for how many years?
This is where the Master Blaster’s price stops looking strange. A five-year limited warranty on the unit andthe motor is not a marketing line; it is a statement about expected duty cycle, and nothing else in this category comes close. Adam’s publishes one year against manufacturer defects. If you are drying several cars a day, that difference is the entire decision and the CFM figures are a footnote.
For a weekend washer, the opposite is true: you will never use up a five-year motor warranty, and you will notice the extra 165 CFM every single wash.
4. Filtered and heated air, or neither?
Adam’s publishes both; MetroVac publishes neither for the MB-3CD, so the two are not directly comparable on this axis.
Filtration is the one we would actually pay for. An unfiltered blower draws in whatever is on your garage floor and delivers it at 200 MPH onto a panel you just washed. It is not a dramatic effect, but it is the opposite of the point.
Heatis more marginal. Warm air evaporates residual moisture faster, which helps on glass and in trim gaps, and it is genuinely pleasant in cold weather — see washing a car in winter. It also means you should not park the nozzle on one spot of hot paint and walk away.
What neither of these fixes
A dryer removes water. It does not remove what was inthe water. If you wash with hard water and let the car sheet dry in the sun you get mineral deposits whether you blow the water off or not — the fix is in the wash, not the dry, and it is covered in how to remove water spots and soaps for hard water.
And a blower will not save a car that is being washed badly. Air drying removes the last contact step from the process, which is a real reduction in swirl risk, but the mitt is still where most damage happens. The two-bucket method and a proper pre-soak matter more than anything on this page.
Prices, and what we have not done
Both of these sit in premium territory and the prices move; the live figures are on the cards above with the date they were read, and we never type a number into the prose. In rough bands the Sidekick is the cheapest of the three by a wide margin, the Air Cannon sits in the middle, and the Master Blaster is usually the most expensive — you are paying for the warranty and the steel.
To be explicit: we have not measured the airflow or the noise of either unit, timed them against each other on the same car, or owned one for five years. Every number above is the manufacturer’s published specification, cited below with the date it was read, and the “Not published” cells are findings in their own right. Our full policy is on how we rank.
