Checklist for Installing Shop Ventilation and Dust Extraction

Start with the Airflow Baseline

Before you touch a single valve or duct, measure the static pressure at the tool port. This is your baseline. Without it, you cannot tell if the system is underperforming or if a new filter load simply changed the curve. Static pressure is the measure of force the air exerts against the walls of the duct. It tells you how much work the fan is doing to push air through the system.

Use a differential pressure gauge. Record the reading at full open dampers and with the tool running. Note the time it takes for the collector to reach full speed. If the pressure drops significantly when a second tool starts, your fan is likely undersized for the simultaneous load. A standard table saw might draw 1,200 cubic feet per minute, while a planer might draw 1,500. If you run both at the same time and the fan is sized for a single tool, the static pressure will fall. The dust will not be captured. It will settle on the floor.

To take an accurate reading, attach the gauge directly to the tool port or a static tap in the duct near the tool. Ensure the gauge is level. A reading of 0.5 inches of water column might be acceptable for a small router, but 1.5 inches is typical for a larger table saw. Compare your reading against the manufacturer’s specification for the tool if available. If the spec is unknown, use the baseline reading as your reference point.

Red flags:

• Pressure drops more than 20% when adding a second tool.
• The collector takes more than 30 seconds to reach full speed.
• Air at the tool port feels weak even with dampers fully open.

Check the Ducting Path

Ducting is where most systems fail. A well sized collector can be killed by a kinked elbow or a crushed section of flex. Walk the entire path from the tool port to the collector. Inspect every joint, elbow, and straight section. Ducting acts as the circulatory system of the extraction unit. If the diameter is too small, the air velocity rises, and friction loss increases. If the diameter is too large, the air velocity drops, and dust settles in the duct.

The ideal duct diameter depends on the air volume and the velocity you want to achieve. For most shop applications, the main run should be sized to keep the air velocity between 4,000 and 6,500 feet per minute. Branching runs should be as close to the tool as practical. A common mistake is running a long, narrow duct to the collector and then expecting the collector to pull enough air to compensate. It will not. The fan cannot overcome the friction loss of a long, narrow run without significant energy input.

Look for:

• Kinks or bends that restrict airflow.
• Leaks at connections, flanges, or clamp points.
• Ducts that are undersized for the main run.
• Long, narrow runs that create excessive friction loss.

Check the material. Flexible ducting is convenient, but it collapses under pressure. If the duct sags or touches the floor, it is restricting airflow. Rigid ducting is stiffer and maintains its shape. Use rigid ducting for the main run and flexible ducting only for short connections to the tools. Ensure all connections are tight. A small leak in a high velocity section can draw in air and reduce the extraction efficiency at the tool port.

Red flags:

• Visible gaps or open clamps.
• Ducts that sag or touch the floor.
• A main run that is much narrower than the collector inlet.
• Multiple sharp bends in a single run.

Verify the Collector Configuration

The collector needs to be the right type for the dust it sees. A baghouse and a cyclone handle different dust loads and particle sizes with different efficiency. Match the collector to the tools you run most. A baghouse is excellent for fine dust and small particle sizes. It captures dust that would otherwise pass through a cyclone. A cyclone is better for coarse shavings and heavy loads. It separates the bulk of the material by gravity before the air reaches the filter.

If you are running a mix of fine sawdust and coarse shavings, a cyclone with a baghouse or filter house downstream is often the best setup. A single filter unit may clog quickly if it sees heavy coarse loads. The coarse material can damage the filter media or block the inlet screens. Check the following:

• The hopper is clean and not blocked.
• The filter media is intact and correctly installed.
• The fan is running at the correct speed.
• The purge system is cycling if the unit has one.

Inspect the cyclone cone. If the cone is worn or damaged, the separation efficiency drops. Fine dust will pass through the cyclone and load the downstream filter. Check the filter media. If it is torn, dust will escape into the shop. If it is clogged, the fan will work harder and the airflow will drop. The purge system, if present, should cycle regularly to remove dust from the filter. If the purge system is stuck or not activating, the filter will load quickly and the static pressure will rise.

Red flags:

• Filter media that looks torn or compressed.
• Hopper that is half full and not emptying.
• Fan speed that fluctuates or is stuck low.
• Purge system that never activates.

Test the Dampers and Airflow Control

Dampers are your primary tool for directing airflow. If they are stuck, misaligned, or undersized, the system will not work as intended. Dampers control the flow of air to each tool port. They must be able to open and close smoothly and seal tightly when closed. Open and close each damper by hand. Listen for air leaking past the blades. Check that the damper position matches the tool in use.

A common problem is a damper that sticks halfway closed, starving the tool of air. This can happen if the damper blade is bent or if the pivot point is dry and stiff. Lubricate the pivot points. Ensure the damper blade is flat and not warped. For multiple tools, you need a way to isolate the active tool and close the inactive ones. If you are using a single damper per tool, make sure the closed position is airtight. If you are using a central header with branch dampers, check the header for leaks.

The damper size should match the duct diameter. A damper that is too small will restrict airflow even when fully open. A damper that is too large may not seal properly. Check the linkage. If the damper is operated by a pull cord or a manual lever, ensure the linkage is secure and not frayed. A broken linkage means the damper will not stay in the open position. The tool will have no airflow.

Red flags:

• Dampers that do not seal when closed.
• Airflow that continues to a closed tool port.
• Damper handles that are loose or broken.
• A header that is leaking at the joints.

Review the Filter System

Filters are the first thing to fail in a dust extraction system. They are also the easiest to maintain if you have a routine. Check the filter media for:

• Tears or holes.
• Excessive loading that blocks airflow.
• Oil or resin buildup.
• Correct installation orientation.

Fine dust loads will load filters quickly. Coarse shavings will clog the inlet screens. If you are running a mix, you need pre-cycling or a cyclone to protect the final filter. Inspect the filter media carefully. If it is dark and clogged, it needs cleaning or replacement. If it is torn, it needs immediate replacement. A torn filter allows dust to escape into the shop. It also reduces the effectiveness of the system.

Oil or resin buildup can coat the filter media and reduce its porosity. This happens when you are cutting treated wood, plywood, or composite materials. The oil and resin stick to the filter and block the air. You can try to clean the filter with a mild detergent and water, but if the buildup is heavy, you may need to replace the filter. Ensure the filter is installed in the correct orientation. Some filters have a specific direction for airflow. Installing them upside down can cause the dust to settle on the top of the filter and block the air.

Red flags:

• Filter media that is visibly dark and clogged.
• Airflow that drops after a few days of use.
• Oil or resin film on the filter surface.
• Filters that are installed upside down.

Confirm Safety Controls

A dust extraction system is not just about comfort. It is a safety device. Wood dust is combustible. Fine dust in the air can create an explosive atmosphere. Check the following safety controls:

• The emergency stop button cuts power to the fan.
• The hopper has a fire suppression system if required.
• The filter area is accessible for cleaning.
• The system has a pressure switch that shuts down the fan if static pressure is too low.

Test the emergency stop button. Press it and ensure the fan stops immediately. If the fan continues to run, the emergency stop is faulty. Replace it. Check the hopper. If the hopper is full, dust can accumulate and create a fire hazard. Empty the hopper regularly. If you have a large shop with high dust loads, consider installing a fire suppression system in the hopper. This can activate if the temperature rises too high.

The filter area must be accessible for cleaning. If the filter is buried in a wall or behind a door, you will not clean it. Ensure you have a ladder or step stool to reach the filter. The pressure switch is a critical safety control. It monitors the static pressure in the system. If the pressure drops too low, it shuts down the fan. This prevents the fan from running dry and overheating. It also alerts you to a problem, such as a clogged filter or a duct leak.

Red flags:

• Emergency stop that does not cut power.
• No pressure monitoring.
• Hopper that is not accessible for cleaning.
• No fire suppression on the collector.

Keep a Maintenance Log

A dust extraction system is not set and forget. The performance degrades with dust loading and mechanical wear. Keep a simple log. Record:

• Date of filter cleaning or replacement.
• Static pressure at the tool port.
• Hopper emptying events.
• Any repairs or adjustments.

This log helps you spot trends. If the pressure drops steadily, you know the filters are loading. If the pressure is stable but the airflow is weak, you have a duct or fan problem. A log is a simple piece of paper or a digital note. You do not need a complex software system. Just record the date, the pressure reading, and the action taken. This gives you a history of the system’s performance. It helps you plan for maintenance. For example, if you find that the filters need cleaning every two weeks, you can schedule that time in your calendar.

Record the static pressure at the tool port after each filter cleaning. This tells you if the cleaning was effective. If the pressure does not improve after cleaning, the filter may be damaged or there is a duct problem. Record any repairs. If you replaced a duct clamp or lubricated a damper pivot, note it. This helps you track the wear and tear on the system.

Red flags:

• No record of filter maintenance.
• Pressure readings that are not tracked.
• Repairs that are not logged.
• Hopper emptying that is irregular.

Quick Reference Table

Check Item	What to Look For	Red Flag
Airflow at Tool Port	Pressure gauge reading	Drop of more than 20% with load
Ducting	Straight, tight, no kinks	Leaks, kinks, undersized runs
Collector Type	Match to dust load	Wrong type for the dust
Dampers	Open and closed freely	Stuck or leaking dampers
Filters	Clean, intact, correct type	Clogged, torn, upside down
Safety Controls	E-stop, pressure switch	No E-stop or no pressure monitoring
Maintenance Log	Date and pressure recorded	No log or missing data

Final Walkthrough

Walk the entire shop. Turn on the tools you use most. Walk to the tool port and feel the air. Check the pressure gauge. Open and close the dampers. Listen to the collector. A good dust extraction system should be quiet. If you hear a loud roar or a rattling noise, something is wrong. Check the fan belt. If it is loose, tighten it. If it is cracked, replace it. Check the fan housing. If there are loose screws, tighten them.

If the airflow is strong at the tool port and the pressure gauge reads steady, you have a working system. If not, you have a problem to fix. Start with the easiest checks. Clean the filters. Check the dampers. Clear the hopper. If the problem remains, move to the ducting and then the fan. A good dust extraction system is not a luxury. It is a safety requirement. Take the time to check it. Your lungs and your shop will be better for it.