A handheld blower ranks among the most used cleanup tools on any construction site. It clears sawdust off work surfaces, pushes debris out of wall cavities before inspection, and dries damp spots ahead of finishing work. Cordless blowers have improved quickly, and newer brushless models move noticeably more air than the tools of a few years ago. The catch is that spec sheets now list two different performance numbers, and buyers need to know what each one measures. This article breaks down those ratings, compares the current models, and walks through the practical choices involved in picking a blower for daily site work. If your work also touches building performance, keep the cleanup tool separate from the diagnostic one: a blower door rig measures leakage in a finished building, and planning building airtightness diagnostics calls for calibrated equipment, not a leaf blower.
CFM and MPH: Two Ratings, Two Different Jobs
CFM stands for cubic feet per minute, and it measures the volume of air the fan moves. MPH measures the speed of that air as it leaves the nozzle. A blower can move a large volume of air slowly or a small volume quickly, and the two numbers describe different capabilities. The DCBL722 brushless model that arrived in spring 2020 is rated at 450 CFM and up to 125 mph, while its predecessor, the DCBL720, was rated at 400 CFM and 90 mph. That works out to a 12.5 percent gain in CFM and a 39 percent jump in top speed.
The speed gain comes partly from a concentrator nozzle that narrows the airflow at the outlet. The 125 mph figure applies with that nozzle installed, and without it the air speed is lower. For comparison purposes, CFM is the more useful number, because it reflects the total volume of air the fan can actually move.
The same measurement discipline applies in building science, where a blower door test uses a calibrated fan to measure the air a house leaks at a set pressure. The equipment is different, but the principle is the same: air volume and air speed are separate values, and knowing which one you are reading matters.
Why CFM Matters More Than MPH
High air speed is useful for dislodging leaves stuck to a porch or sawdust packed into a corner. High CFM is what clears a large flat area efficiently, because it moves a wide band of air. On a job site, most cleanup work favors volume over velocity.
Reading the Spec Sheet
Check three things on any blower spec sheet: the CFM rating, the mph rating, and the conditions attached to each. If the mph figure requires a concentrator nozzle, expect the tool to perform differently without it.
Use this sequence when comparing two blowers side by side:
- Compare CFM first, since it reflects total cleanup capacity.
- Check whether the mph rating depends on an accessory nozzle.
- Note the battery class the tool accepts.
- Compare weight without battery, because packs add two to three pounds.
- Look for variable speed and lock-on controls, which matter for extended use.
The Cordless Blower Lineup Compared
The cordless blower market spans compact job site models up to high-output units. The table below lists the main 20V Max and FlexVolt models announced around 2020, with their published ratings and typical bare tool pricing.
| Model | Max Air Speed | Max Airflow | Typical Price | Notes |
|---|---|---|---|---|
| DCE100 | 135 mph | 100 CFM | $119 bare | Compact job site blower |
| DCBL720 | 90 mph | 400 CFM | $139 bare | Previous generation |
| DCBL722 | 125 mph* | 450 CFM | $139 bare | New brushless model; *with concentrator nozzle |
| DCBL770 | 129 mph | 423 CFM | $199 bare | FlexVolt 60V Max |
| DCBL772 | 125 mph | 600 CFM | $269 with battery | FlexVolt with 3.0Ah pack |
| DCBL590 | 142 mph | 450 CFM | Discontinued | 40V Max model |
| DCBL790 | 120 mph | 400 CFM | Discontinued | 40V Max backpack blower |
The range shows how much the platform matters. The compact DCE100 trades airflow for portability, while the FlexVolt models nearly double the CFM of the entry-level unit. The 40V Max models performed similarly to the FlexVolt line, but the 40V Max system was discontinued in 2019, so new buyers should not invest in that battery line.
Spec sheets only tell part of the story. Independent reviewers consistently find that real output depends on battery charge, nozzle setup, and technique. The same lesson shows up across tool categories; for example, this XR brushless impact driver review demonstrates how hands-on testing reveals differences that paper ratings hide.
Match the Tool to the Task
A general contractor doing daily cleanup needs 400 CFM or more. A finish carpenter clearing dust off a miter saw station can get by with a compact unit. Backpack blowers make sense for large lots and multi-story site work, where the weight moves to your hips instead of your arms.
Dust, Debris, and Moisture
Blowers push material; they do not collect it. On dusty jobs, pair the blower with a vacuum for final cleanup. For wet concrete dust or standing water, a blower can speed drying, but confirm the surface can handle the air pressure before you start.
Battery Platforms and Runtime Planning
The biggest design change in the new model generation is the battery socket location. Moving the battery to the rear of the tool lets it accept larger 20V Max packs and FlexVolt batteries, which extends runtime significantly. The previous model mounted the battery at the base, which limited pack size and changed the balance of the tool.
Runtime planning starts with the battery, not the tool. A 5.0Ah pack holds roughly two and a half times the energy of a 2.0Ah pack, so the same blower runs far longer with the larger battery. Contractors who already own a battery platform should compare blower prices against the cost of additional packs.
Runtime Math for a Full Day
Estimate your cleanup time per day, then buy enough batteries to cover it with a reserve. A framing crew doing end-of-day cleanup typically spends twenty to forty minutes blowing out the floor. At high speed, a 5.0Ah pack on a high-output blower may not cover that whole window, so plan for two packs per blower in daily rotation.
Bare Tool vs Kit
A bare tool runs about $139 in the example above; the kit with a 5.0Ah battery and charger sells for about $199. If you already own the platform, the bare tool is the cheaper path. If you are starting fresh, the kit price roughly matches the cost of a single battery, so the tool comes close to free.
The same platform decision repeats across every cordless category, and crews comparing cordless chainsaws across brands face the same question: which battery line do I commit to, and what does that commitment cost over five years?
Weight, Ergonomics, and Daily Use
The new brushless blower weighs 5.43 pounds without a battery. Add a 5.0Ah pack and the tool sits near eight pounds, which is a real consideration for someone holding it overhead to clear ceiling dust or blowing out a roof valley.
Ergonomic details matter as much as the weight number. A redesigned paddle trigger gives better control at partial speed than a traditional trigger, and a variable speed dial lets you dial down power for delicate work. The lock-on switch keeps the blower running without holding the trigger, which saves grip strength during long cleanup passes.
Ergonomic Features That Reduce Fatigue
Features worth checking before you buy:
- Paddle or traditional trigger; paddle designs spread the load across more fingers.
- Lock-on switch for continuous operation.
- Variable speed control for matching power to the task.
- Battery placement; rear mounts balance the weight over your hand.
- Nozzle options, including concentrator tips for high-speed work.
Trigger Design and One-Handed Use
Some tasks require one hand on the blower and the other on a ladder or a broom. Tools with rear batteries and paddle triggers are easier to control one-handed than tools with base-mounted batteries and heavy triggers.
Voltage branding adds confusion, because the numbers do not always line up with performance. Understanding why cordless tool voltage ratings differ between brands explains how a 20V Max brushless blower can outperform an older 40V design.
Safety, Maintenance, and Recall Awareness
A blower moves air at up to 125 mph, which is enough to send debris flying into eyes or skin. Wear eye protection on every pass, and add hearing protection for extended high-speed runs. Never point the nozzle at people, and be careful around open windows and occupied spaces.
A Pre-Use Checklist
- Inspect the nozzle and battery contacts for damage.
- Confirm the battery is fully charged and seated securely.
- Clear the work area of loose cables and trip hazards.
- Put on eye protection before starting.
- Check the surrounding area for people before you begin.
Storing the Blower Between Jobs
Store the tool with the battery removed, keep the nozzle clean, and wipe down the air intake after dusty days. Lithium batteries last longest when stored partially charged in cool, dry conditions.
Registration matters for every new tool, because recall notices reach registered owners first. Power tool recalls are not rare; a sliding compound miter saw recall from the same era shows how quickly a safety defect can surface in a popular product line.
Airflow Know-How Pays Off Across the Site
Choosing a blower comes down to matching airflow to the work: high CFM for open areas, high speed for stuck debris, the right battery platform for runtime, and a weight that does not wear you out. The 450 CFM, 125 mph class of brushless blowers is a solid middle ground for most site cleanup, and the concentrator nozzle turns one tool into two.
The same understanding of air movement carries beyond cleanup. Builders who measure building performance apply identical logic in reverse: instead of moving air out of a space, they measure how much air moves through the building envelope. Running a blower door test and interpreting the results gives a leakage rate in air changes per hour, the same CFM vocabulary applied to a whole house.
Buy the blower that fits your daily work, keep the batteries charged, and keep both sides of the air movement equation in view. The tool that clears the site and the test that measures the envelope both reward the same basic knowledge: air volume, air speed, and pressure are measurable, and measuring them changes how you work.