Four machines, four jobs
| Machine | What it does | How makers rate it | Where it fits |
|---|---|---|---|
| Dust collector | Moves a large volume of air through 4 in and larger ducts from stationary machines | CFM, ideally at a stated static pressure; maximum static pressure | Table saws, jointers, planers, band saws |
| Cyclone separator | Sits in front of a collector or vacuum and drops most debris into a drum | The airflow range it is built for | An add-on, not a machine on its own |
| Shop vacuum or extractor | Pulls a smaller volume of air hard through a small hose | CFM and sealed suction or water lift | Hand-held sanders and saws, small ports, clean-up |
| Air cleaner | Recirculates room air through a filter | CFM through its filter, often at several speeds | Fine dust left in the air after the work |
Each machine is explained further in shop vacuums and shop air filters. An air cleaner does not replace capture at the source.
OSHA calls engineering controls — exhaust ventilation with collectors at the points where dust is produced — the preferred approach for wood dust, and personal protective equipment a short-term solution. That is the order this guide follows: capture at the machine first, filter the room second, and a respirator where dust remains.
Why wood dust matters
OSHA says wood dust becomes a potential health problem when particles from sanding and cutting become airborne, and that breathing them may cause allergic respiratory symptoms, mucosal and non-allergic respiratory symptoms, and cancer — while noting the extent of these hazards, and which woods are involved, has not been clearly established. Its hazard page adds irritation of the eyes, nose and throat, reduced lung function, and asthma from western red cedar dust. The National Toxicology Program lists wood dust as known to be a human carcinogen, on evidence of cancers of the nasal cavity and paranasal sinuses; OSHA notes IARC classifies it in Group 1.
Chips on the floor are not what these limits measure. OSHA's limits are set on samples taken from the air a worker breathes, and its table separates total dust from the finer respirable fraction. Fine dust stays airborne after the visible chips have settled, which is why the room still matters once the machines are connected.
| Authority | Limit | Averaging | Scope |
|---|---|---|---|
| OSHA PEL, Table Z-1 (particulates not otherwise regulated) | 15 mg/m³ total dust; 5 mg/m³ respirable fraction | 8-hour time-weighted average, breathing-zone samples | Enforceable for employers; OSHA regulates wood dust under this entry |
| NIOSH REL | 1 mg/m³; wood dust listed as a potential occupational carcinogen | Time-weighted average, up to a 10-hour day in a 40-hour week | A recommendation, not an enforceable limit |
| OSHA 1989 wood dust limits | — | — | Remanded by a court; OSHA says they are not in force |
Figures as published by OSHA and NIOSH. They describe workplace exposure, not a safe level for a home shop.
Fire and explosion
OSHA warns that significant accumulations of fine wood dust can be a fire and explosion hazard. Its combustible dust page explains why: any combustible material can burn rapidly when finely divided, and suspended in air at the right concentration it can become explosible; wood is on its list of such materials. In 1997 OSHA issued a bulletin on cyclone collectors installed inside woodworking plants, citing the fire code then in force — NFPA 664 — which required collectors to be located outside buildings, with narrow exceptions. That bulletin is about industrial workplaces, and BenchRoot does not give explosion venting, suppression or collector-placement engineering; a commercial shop needs the current codes and a qualified professional.
Safety— What the collector makers say
Grizzly's manuals ask for a permanently installed collector to be located away from the working area or in another room, to reduce exposure to fine dust; for no open flames or pilot lights in the same room; for the drum to be emptied wearing a respirator, away from ignition sources; and for no metal or stones to be collected, because they can strike sparks. Grizzly's manuals also give their own instructions for grounding plastic duct in their systems — follow the manual for your collector, not general rules of thumb.
Single-stage and two-stage collectors
A single-stage collector draws air straight through its impeller; chips and dust drop into a lower bag, and the air leaves through an upper bag or canister filter. Grizzly's G1028Z2 (1.5 HP, a 2.5 micron upper bag) and G0548ZP (2 HP, a 1 micron canister) are this type, as is the 1 HP wall-hanging G0710 with a 30 micron bag. A two-stage collector — a cyclone — spins the air through a cone first, so most debris falls into a drum before reaching the impeller and the cartridge filter; Grizzly's G0860, G0861 and G0862 are rated for wood dust. A separate cyclone separator such as Grizzly's G0863 sits in front of a single-stage collector of 1.5–3 HP; Grizzly says it separates heavy chips and large particles and reduces suction loss from clogged filters.
Reading airflow: CFM and static pressure
CFM — cubic feet per minute — is the volume of air a collector moves, and it is not one number. Every duct, elbow, hose and filter resists the flow; that resistance is static pressure, measured in inches of water. The more resistance, the less air. A collector's highest CFM is measured with almost nothing in the way, and its maximum static pressure with no air moving at all; neither is what it delivers at the end of a real duct run.
- How makers state it. Grizzly lists its bag collectors by "air suction capacity" — 1300 CFM for the G1028Z2, 1700 CFM for the G0548ZP — with no static pressure beside the figure; Grizzly defines air suction capacity as the most air a collector moves at its inlet, fully assembled and not connected to any duct. Its cyclones are listed at a stated static pressure: 868 CFM at 1.8 in for the G0860, 1941 CFM at 2.9 in for the G0862. Compare like with like, and prefer a curve or table where the maker gives one.
- Grizzly's design method. Its manuals estimate the airflow a port needs by its size — about 400 CFM for 4 in, 850 CFM for 6 in — and give a rule of thumb of at least 3500 ft/min in a main line and 4000 ft/min in a branch. You total the losses of one run, including a seasoned filter, and read the airflow at that total off the collector's curve. These are Grizzly's figures for its collectors, not a general standard.
- Flexible hose. Grizzly warns that corrugated hose can increase static pressure loss by as much as 50% over smooth-wall duct, and its manuals recommend keeping flexible hose short. Close blast gates on unused lines.
What machines ask for
| Machine | Port | Maker's airflow figure |
|---|---|---|
| Grizzly G0555LX 14 in band saw | 4 in | At least 400 CFM at the port |
| Powermatic PWBS-14CS 14 in band saw | 4 in | At least 350 CFM |
| SawStop PCS31230 cabinet saw | 4 in | At least 350 CFM |
| Powermatic 1285 12 in jointer | 4 in | At least 800 CFM |
| DEWALT DW735 13 in planer | 4 in, fan-assisted | A dust collector; DEWALT advises against a shop vacuum |
Each figure belongs to that machine only and is not averaged. Grizzly warns that its port figure is not to be confused with a collector's rating. Jointers and planers make a large volume of chips, which is why their makers ask for a collector.
Filters: microns, HEPA and MERV
Filter ratings are not interchangeable. Grizzly states a micron figure for each filter — 30 micron for the G0710's bag, 2.5 micron for the G1028Z2's, 1 micron for its canisters, 0.2–2 micron for the G0440's cartridge — in its own terms. HEPA has a definition: the EPA says a HEPA filter, as defined by the U.S. Department of Energy, can theoretically remove at least 99.97% of particles of 0.3 microns, the size that gets through most easily. MERV is a different scale, rating capture of particles from 0.3 to 10 microns under an ASHRAE test, and the EPA notes HEPA filters are not rated on it. Grizzly's G0944HEP filter is rated at 99.97% of 0.3 micron, which Grizzly also calls MERV-17; BenchRoot gives that as Grizzly's wording and does not convert microns to MERV.
Note— Noise
Grizzly lists sound ratings of 75–77 dB for the G0944, 78–79 dB for the G0860 and G0861 and 83–85 dB for the G0440 and G0441, without stating the distance or conditions in the specification tables reviewed, so they are not compared here.
Before connecting a collector
- Each machine's port size and the maker's airflow figure
- The collector's airflow at a stated static pressure, or its curve
- Duct runs short, flexible hose short, blast gates on unused lines closed
- Filter rating in the maker's terms; HEPA only where so defined
- Wood only: no metal, stones or sparks into a wood collector
- Collector placed and grounded as its manual says; drum emptied away from ignition
- A respirator for emptying and for dust that escapes
Where to go next
- Smaller machines: shop vacuums and dust extractors and shop air filters.
- Choosing: how to choose a dust collector and how to choose a shop vacuum.
- A build: dust collection projects.
- Machines that need collection: the table saw guide, the jointer guide, the planer guide and the band saw guide. Sanding dust: the sander guide.
Sources
Health statements come from OSHA, NIOSH and the National Toxicology Program only. Exposure limits are given with their authority, measure, averaging time and scope. Collector, port and filter figures are each maker's for its own machine and are not averaged or converted; Grizzly's duct design figures are its own estimates for its collectors. Nothing here is fire-protection or explosion engineering. No collector was tested.
- 1.
Wood Dust (safety and health topic overview). U.S. Department of Labor, Occupational Safety and Health Administration.
Used for: Wood dust becoming a potential health problem when particles from processes such as sanding and cutting become airborne; allergic, mucosal and non-allergic respiratory symptoms and cancer; the extent of the hazards and the wood types involved not clearly established.
- 2.
Wood Dust: Hazard Recognition. U.S. Department of Labor, Occupational Safety and Health Administration.
Used for: Irritation of eyes, nose and throat, reduced lung function, and wood dust as a human carcinogen; western red cedar dust and asthma; significant accumulations of fine wood dust as a fire and explosion hazard; NTP and IARC classifications; OSHA's 1989 wood dust limits remanded and not in force.
- 3.
Wood Dust: Standards. U.S. Department of Labor, Occupational Safety and Health Administration.
Used for: Wood dust regulated as Particulates Not Otherwise Regulated under Table Z-1.
- 4.
Wood Dust: Possible Solutions. U.S. Department of Labor, Occupational Safety and Health Administration.
Used for: Engineering controls — exhaust ventilation with collectors at the points where dust is produced — as the preferred approach; personal protective equipment as a short-term solution; respirators within a respiratory protection program.
- 5.
29 CFR 1910.1000 Table Z-1, Limits for Air Contaminants. U.S. Department of Labor, Occupational Safety and Health Administration.
Used for: Particulates not otherwise regulated: 15 mg/m³ total dust and 5 mg/m³ respirable fraction, as 8-hour time-weighted averages from breathing-zone samples.
- 6.
NIOSH Pocket Guide to Chemical Hazards: Wood dust. National Institute for Occupational Safety and Health.
Used for: NIOSH's recommended exposure limit for wood dust, 1 mg/m³ as a time-weighted average, with wood dust listed as a potential occupational carcinogen.
- 7.
NIOSH Pocket Guide to Chemical Hazards: Introduction. National Institute for Occupational Safety and Health.
Used for: A NIOSH REL time-weighted average applying to a workday of up to 10 hours in a 40-hour week; an OSHA PEL time-weighted average to an 8-hour shift in a 40-hour week.
- 8.
Report on Carcinogens, Fifteenth Edition: Wood Dust. National Toxicology Program, U.S. Department of Health and Human Services, 2021.
Used for: Wood dust listed as known to be a human carcinogen, first in 2002, on evidence of cancers of the nasal cavity and paranasal sinuses.
- 9.
Combustible Dust (safety and health topic overview). U.S. Department of Labor, Occupational Safety and Health Administration.
Used for: Combustible material burning rapidly when finely divided and, suspended in air at the right concentration, becoming explosible; wood among the materials named.
- 10.
Hazard Information Bulletin: Improper Installation of Wood Dust Collectors in the Woodworking Industry. U.S. Department of Labor, Occupational Safety and Health Administration, 1997.
Used for: An OSHA bulletin on cyclone collectors installed inside woodworking plants, citing NFPA 664 as then in force on locating collectors outside buildings, with exceptions, for industrial workplaces.
- 11.
What is a HEPA filter?. U.S. Environmental Protection Agency.
Used for: HEPA as defined by the U.S. Department of Energy: at least 99.97% of particles of 0.3 microns, the most penetrating particle size.
- 12.
What is a MERV rating?. U.S. Environmental Protection Agency.
Used for: MERV as a rating of how well a filter captures particles between 0.3 and 10 microns under an ASHRAE test method, and HEPA filters as outside the MERV scale.
- 13.
Model G0548ZP / G1028Z2 / G1029Z2 / G1029Z2P Dust Collectors owner's manual (for models manufactured since 8/18). Grizzly Industrial.
Used for: Single-stage collectors: the G1028Z2 at 1.5 HP with a 2.5 micron bag and the G0548ZP at 2 HP with a 1 micron canister, each listed by 'air suction capacity' (1300 and 1700 CFM) and maximum static pressure (9 and 10 in), with a 6 in inlet and a 4 in adapter; Grizzly's duct design method and grounding instructions.
- 14.
Model G0703 1-1/2 HP Cyclone Dust Collector owner's manual (for models manufactured since 9/20). Grizzly Industrial.
Used for: Grizzly's definition of air suction capacity as the maximum airflow at the inlet with no ducting connected, and of filters rated by the size of dust that can pass through them; a 1.5 HP cyclone rated at 775 CFM at 1.80 in of static pressure on a 30 A, 110 V circuit.
- 15.
Model G0710/G0710P 1HP Wall Hanging Dust Collector owner's manual (for models manufactured since 9/12). Grizzly Industrial.
Used for: A 1 HP wall-hanging collector: 537 CFM, a 4 in inlet and a 30 micron bag.
- 16.
Model G0944/G0944HEP 1-1/2 HP Wall-Mount Dust Collector owner's manual (for models manufactured since 03/21). Grizzly Industrial.
Used for: A 1.5 HP wall-mount collector in two versions, a 1 micron canister and one with a filter rated at 99.97% of 0.3 micron that Grizzly also calls MERV-17; a warning not to collect metal or stones, which can make sparks.
- 17.
Model G0860/G0861/G0862 Cyclone Dust Collectors owner's manual (for models manufactured since 02/21). Grizzly Industrial.
Used for: Two-stage cyclones rated by airflow at a stated static pressure: 868 CFM at 1.8 in (G0860), 1023 CFM at 1.2 in (G0861) and 1941 CFM at 2.9 in (G0862); wood as the approved dust type; sound ratings without test conditions.
- 18.
Model G0440/G0441 Cyclone Dust Collectors owner's manual (for models manufactured since 03/12). Grizzly Industrial, 2020.
Used for: The G0440's measured airflow at six static pressures, from 1354 CFM at 2.5 in to 338 CFM at 10.0 in, with the test arrangement; Grizzly's estimates of airflow by port size, its 3500 and 4000 FPM rule of thumb, corrugated hose adding as much as 50% loss, a seasoned filter in the calculation; locating the collector away from the work area, no open flames or pilot lights, and emptying with a respirator away from ignition sources.
- 19.
Model G0863 Grizzly Growler Cyclone Separator instructions (for models manufactured since 6/21). Grizzly Industrial, 2022.
Used for: A cyclone separator added in front of a 1.5–3 HP single-stage collector, within 750–2300 CFM, that Grizzly says reduces suction loss from clogged filters.
- 20.
Model G0572 Hanging Air Filter with Remote owner's manual (for models manufactured since 01/21). Grizzly Industrial, 2021.
Used for: An air filter for ambient dust after cutting or sanding, which Grizzly says lets dust too small for its filter back into the room.
- 21.
Model G0555LX 14" Deluxe Bandsaw owner's manual (for models manufactured since 1/14). Grizzly Industrial.
Used for: A 4 in band saw port needing at least 400 CFM, not to be confused with a collector's rating.
- 22.
Operating Instructions and Parts Manual, 14" Woodworking Band Saw, Model PWBS-14CS (M-1791216, revision G1). Powermatic, 2018.
Used for: A 4 in band saw chute needing at least 350 CFM.
- 23.
Owner's Manual, 10" Professional Cabinet Saw, Model PCS31230. SawStop.
Used for: A cabinet saw's 4 in port with at least 350 CFM.
- 24.
Operating Instructions and Parts Manual, 12-inch Jointer, Models 1285 and 1285T (M-0460216, edition 7). Powermatic, 2023.
Used for: A 12 in jointer's 4 in port and at least 800 CFM of dust collection.
- 25.
Used for: A planer whose fan ejects chips from a 4 in port; DEWALT advises a dust collector, not a shop vacuum.
About this guide
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