Smoke & Gas Detector Insect Screen is used for keeping insects, spiders and dust out of the sensing chamber of smoke, heat and gas detectors so they do not cause false alarms or hide real smoke. UL 217 is the reference cited for it on drawings, datasheets and purchase orders.
What UL 217 Means for Smoke & Gas Detector Insect Screen
The dimensions in the table below are supplied to suit UL 217. Where the standard sets requirements for the finished appliance, device or system, compliance testing of that assembly stays with its manufacturer; we supply the metal mesh part to the drawing and can provide material certificates and dimensional reports with the shipment.
Smoke & Gas Detector Insect Screen Dimensions
| Size | Outer diameter (mm) | Length (mm) | Mesh | Aperture (mm) |
|---|---|---|---|---|
| Ring 40 | 40 | 12 | 40-Mesh SS304 | 0.385 |
| Ring 52 | 52 | 14 | 40-Mesh SS304 | 0.385 |
| Cap 20 | 20 | 8 | 60-Mesh SS304 | 0.233 |
Specifying Smoke & Gas Detector Insect Screen Beyond the Standard
- Aperture: Openings around 0.4 mm stop small insects while letting smoke enter freely; listing standards cap the maximum size.
- Form: Ring screens wrap the chamber; caps cover single sensor openings.
- Material: SS304 resists humidity in bathrooms, kitchens and unheated spaces.
When Smoke & Gas Detector Insect Screen Is Not the Right Choice
Not a filter for kitchen grease or cooking steam; nuisance alarms there need a different detector type or location.
