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Home, HVAC & Safety Mesh · NFPA 211 / IRC R1003.9 · Application guide

What Is Chimney Cap & Fireplace Spark Arrester Screen Used For?

A stainless steel chimney cap with a woven wire spark arrester screen around its sides mounted on top of a brick chimney

Chimney Cap & Fireplace Spark Arrester Screen is used primarily for stopping burning embers from leaving the chimney and keeping birds and animals out, while letting flue gas draw freely. This page lists the industries and assemblies where it is specified, the selection criteria that matter for each application, handling and installation practice, and the cases where a different mesh, screen or filter type is the correct choice. It is supplied to NFPA 211 / IRC R1003.9.

Typical Applications for Chimney Cap & Fireplace Spark Arrester Screen

Where Chimney Cap & Fireplace Spark Arrester Screen is specified and bought:

  • Chimney sweeps & installers: spark screens fitted to new and existing chimney caps.
  • Wildfire-prone regions: mandatory spark arresters on wood-burning chimneys.
  • Stove & fireplace makers: screens supplied with cap kits.
  • Outdoor fire pits & pizza ovens: spark screens on flues and lids.

How to Specify Chimney Cap & Fireplace Spark Arrester Screen for Your Application

  • Opening size: Many codes require openings no larger than 1/2 in (12.7 mm) and no smaller than 3/8 in so the screen does not clog with soot.
  • Wire & alloy: SS304 or SS316 heavy wire survives flue heat and creosote; galvanized corrodes quickly.
  • Screen area: Free area of the screen should be at least four times the flue area so draft is not restricted.
  • Standard: Quote NFPA 211 / IRC R1003.9 and the size designation from the table on the product page, plus any value you changed in the technical drawing.

Handling & Installation Practice

  • Inspect the screen at every sweep; creosote glaze can close openings and choke the draft.
  • Fit the cap with stainless fasteners so it can be removed for sweeping.

Common Selection Mistakes with Chimney Cap & Fireplace Spark Arrester Screen

  • Choosing insect-fine mesh, which blocks with soot and causes smoke spillage indoors.
  • Using galvanized screen on a wood stove, which scales and fails within a few seasons.

Where Chimney Cap & Fireplace Spark Arrester Screen Is Not the Right Choice

Not a flue liner or rain cap substitute, and not designed for high-temperature industrial stacks.

If This Construction Is Not the Right Fit

Closely related mesh types for the same duty — compare open area, aperture range and cleanability before you commit.

Gas Regulator & Valve Inlet Filter ScreenGas Regulator & Valve Inlet Filter ScreenANSI Z21.80 / EN 88-1Hydrophobic Mesh Moisture-Eliminator Air FilterHydrophobic Mesh Moisture-Eliminator Air FilterAMCA 500-L / ASHRAE 62.1Pet Water Fountain Pre-Filter ScreenPet Water Fountain Pre-Filter ScreenFDA 21 CFR / EU 1935/2004 food contactGas Appliance Burner & Flame Arrestor MeshGas Appliance Burner & Flame Arrestor MeshEN 437 / ANSI Z21 appliance

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

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Set the size and options in the drawing above, then send the exact configuration straight to this form.

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Specification
Business Information

Dimensions & Specifications (NFPA 211 / IRC R1003.9)

Mesh countWire diameter (mm)Aperture (mm)Micron rating (u00b5m)Open area (%)Material
2-Mesh1.20011.5001150082.4SS304
3-Mesh1.0007.470747077.8SS304
4-Mesh0.8005.550555076.4SS304 / galvanized

Frequently Asked Questions

What is Chimney Cap & Fireplace Spark Arrester Screen used for?

Stopping burning embers from leaving the chimney and keeping birds and animals out, while letting flue gas draw freely.

What mesh size should a chimney spark arrester be?

Openings between 3/8 and 1/2 in are typical — fine enough to stop embers, coarse enough not to clog with soot.

Is a spark arrester required on my chimney?

Many jurisdictions require one, especially in wildfire areas; check the local fire code.

Why is smoke coming back into the room?

A soot-blocked spark screen is a common cause; clean it and check the opening size.

Can I get a quote for Chimney Cap & Fireplace Spark Arrester Screen to my own drawing?

Yes. Set the size and any custom value in the technical drawing on the product page and send it with the quote form; we reply within one business day.