FRL Systems for Auto Repair Shops: What to Buy First

For most auto repair shops, the first FRL purchase should be a correctly sized filter regulator, followed by lubrication only where the connected tools require it. An FRL protects pneumatic tools from water, debris and unstable pressure. Browse our air preparation and FRL systems.

What to buy first

How to size an FRL

1. Total the CFM of tools that may run together.
2. Add practical flow margin.
3. Match pipe and port size to avoid restriction.
4. Confirm maximum inlet pressure.
5. Choose filtration and drain type for the moisture load.

Read our five-step FRL sizing guide before ordering.

Bay count guide

Common mistakes

• Choosing only by port size
• Ignoring flow at the required pressure
• Adding lubrication to paint or breathing-air lines
• Installing the unit too far from the point of use
• Failing to drain collected moisture

Explore pneumatic air tools and ask us to match the FRL to the shop.

Frequently asked questions

Does every shop need a lubricator?

No. Use one only when tool and process requirements allow oil in the line.

What micron filter should I choose?

A 5 micron general-purpose filter is common, but sensitive processes may need finer staged filtration.

Can one FRL serve several bays?

Yes, if flow, pipe sizing and pressure drop are calculated correctly.

Where should an FRL be installed?

Install where it can protect the downstream equipment and remain accessible for draining and service.

How often should it be maintained?

Inspect drains, bowls, elements and pressure settings on a schedule based on moisture and duty.

Can TendSupplies size a system?

Yes. Send bay count, compressor output, pipe size, tool CFM and simultaneous-use assumptions.

Request a shop quote

Contact TendIndustrial Support Team for a one-bay, multi-bay or fleet-shop FRL recommendation and bulk pricing.