CLLOMAGY 17×29 Multi-Flue Chimney Cap Review
By Chimney Insight Editorial Team
Posted on October 21, 2026
1 of 5 — CLLOMAGY 17 by 29 inch black galvanized steel multi-flue chimney cap
2 of 5 — CLLOMAGY chimney cap dimension diagram
3 of 5 — CLLOMAGY chimney cap side-mount installation diagram
4 of 5 — CLLOMAGY chimney cap weather and animal protection illustration
5 of 5 — CLLOMAGY chimney cap installed examples
CLLOMAGY RFCC-021 17×29 multi-flue chimney cap
Verdict: A substantial galvanized-steel cover for a narrow range of large, rectangular multi-flue tile layouts. Its useful sizing graphics make it easier to shortlist, but the fit and installation method still need professional confirmation.
Best for: A sound masonry chimney whose measured flue-tile envelope falls within the seller’s stated range and can accept the listed side-mount method.
As an Amazon Associate, Chimney Insight earns from qualifying purchases.
What this cap is—and what it is not
The exact product tied to this review is ASIN B0F2SGZH4V, listed by CLLOMAGY as model RFCC-021. It is a rectangular multi-flue cover rather than a round single-flue cap. The hood and mesh are intended to reduce direct entry by rain, snow, leaves and animals while leaving an exhaust path around the sides.
A cap does not repair a cracked crown, failed flashing, damaged flue tile or unsafe appliance connection. It also is not automatically suitable for every chimney that looks roughly the same size. The appliance type, flue geometry, clearances, draft requirements and attachment surface matter. Treat the seller’s broad compatibility language as a starting point, not as approval for a specific system.
Verified specifications
| Exact product | CLLOMAGY 17×29 multi-flue chimney cap |
|---|---|
| Model / ASIN | RFCC-021 / B0F2SGZH4V |
| Listed body size | 17 × 29 × 11 inches |
| Seller image dimensions | Base approximately 31 × 19 inches; hood approximately 35.5 × 26.4 inches; height 11 inches |
| Listed fit range | Outside flue-tile envelope from 16.9 × 25.2 inches to 19 × 31 inches |
| Base | Seller states 14-gauge galvanized steel |
| Hood | Seller states 24-gauge galvanized steel with roll-formed edges |
| Finish | Black powder-coated galvanized steel |
| Package dimensions | 36.25 × 23.5 × 2.5 inches, as listed by Amazon |
| Listed item weight | 17.41 pounds |
| Mounting description | Assembly required; seller shows side mounting through pre-drilled holes with screws |
These are listing and manufacturer-supplied specifications, not Chimney Insight measurements. Confirm the current variation and instructions before ordering.
Pros and limitations
Pros
- Clear dimensional guidance: the supplied graphics show the base, hood, height and claimed fit range.
- Heavy base specification: a listed 14-gauge galvanized base gives the mounting area more substance than the thinner 24-gauge hood.
- Weather-facing design: the overhanging hood and mesh address common top-entry concerns without sealing the exhaust opening.
- Black finish: the powder-coated appearance may blend with many roofs and masonry colors.
Limitations
- The listing’s nominal “17×29” name is not the full installed footprint.
- Galvanized steel is not the same material as stainless steel; climate, fuel and local exposure may affect the preferred material.
- Seller photos do not prove the mounting surface, fasteners or clearances are suitable for your chimney.
- It requires roof access and assembly, which may make professional installation the sensible choice.
Fit and measurement: the decision point
The most important information is the seller’s claimed fit range: an outside flue-tile envelope from 16.9 × 25.2 inches up to 19 × 31 inches. That range is not the same as the outside edge of the chimney crown. Measure the component the cap actually surrounds, identify all projecting flues, and record the height of each tile above the crown.
Also check the hood’s approximately 35.5 × 26.4-inch footprint against nearby roof slopes, walls, flashing and other terminations. A cap can fit around the flues yet still conflict with the roof or fail to provide the necessary clearance. If there is more than one appliance, have a qualified chimney professional confirm that the cap does not interfere with safe venting.
Construction and documented features
The seller identifies a 14-gauge galvanized-steel base and a 24-gauge galvanized hood with roll-formed edges. The difference makes sense structurally: the base carries mounting loads, while the hood forms the rain cover. Mesh panels surround the opening. The listing states that the finish is black powder coat.
The seller claims the hood and mesh help keep out rain, snow, leaves, birds and small animals and reduce some crosswind effects. Those are manufacturer claims. We have not measured wind performance, water entry, corrosion resistance or draft. A cap cannot guarantee a dry chimney if water is entering at the crown, flashing, masonry or chase cover.
Setup and installation checks
The supplied images show a unit that needs assembly. The seller describes aligning the base around the flue-tile area and securing it through pre-drilled holes using screws. Before any work begins, confirm the current package contents, fastener type, required tools, substrate condition and installation instructions.
- Inspect first: Do not attach a new cover to loose flue tile, cracked crown material or unstable masonry.
- Confirm the system: Factory-built chimneys may require a listed termination from the chimney manufacturer. A generic masonry cap should not be substituted by appearance alone.
- Measure safely: Roof access, fall protection and nearby power lines make this unsuitable for casual trial-and-error.
- Protect venting: Preserve required clearances and avoid obstructing any flue.
- Document the finished work: Photographs should show the attachment points, hood clearance and each flue opening.
Safety: Do not install or modify a chimney termination while an appliance is operating. If the chimney serves gas, oil, coal or a listed factory-built system, get compatibility confirmation from the appliance or chimney manufacturer and a qualified professional.
Who should buy it?
Consider this cap if you have a masonry chimney with a large rectangular multi-flue arrangement, the measured envelope falls inside the stated range, the crown and tiles are sound, and the side-mount method is acceptable. It is most compelling when the supplied dimensions closely match your measurements and you prefer a black galvanized-steel design.
Who should avoid it?
Avoid it when you only know the rough chimney width, when the flue tiles project outside the fit range, when the termination belongs to a factory-built system, or when the crown needs repair. Also compare stainless-steel options if the chimney serves fuels or conditions for which stainless is specified or preferred.
Maintenance and inspection
Include the cap in regular chimney inspections. Look for loose fasteners, bent mesh, corrosion, animal damage and accumulated debris. The cap should remain secure without blocking the exhaust path. After severe weather, check from a safe viewpoint for movement or damage. Cleaning frequency depends on the system and deposits; follow professional inspection findings rather than reaching through the mesh from an unsafe position.
Good candidate only after a measurement match
The CLLOMAGY RFCC-021 offers useful dimensional information, a substantial listed galvanized base and a full mesh enclosure. Its value depends on exact fit and system compatibility, not the “17×29” label alone.
Three checks before purchase
- Measure the outside flue-tile envelope and tallest projection.
- Confirm the full hood footprint and attachment surface.
- Verify appliance, fuel and chimney-system compatibility.
Ready to compare the exact listing?
Check the CLLOMAGY cap on AmazonAs an Amazon Associate, Chimney Insight earns from qualifying purchases.See other reviewed chimney products
Frequently asked questions
Does 17×29 describe the full outside size?
No. The seller’s diagram shows an approximately 31 × 19-inch base and 35.5 × 26.4-inch hood. The nominal size refers to the model category, so use the full dimensions for planning.
What flue-tile sizes does the seller claim it fits?
The listing states an outside flue-tile envelope from 16.9 × 25.2 inches to 19 × 31 inches. Confirm the current listing and measure all projections before ordering.
Is this cap stainless steel?
No. The exact ASIN reviewed here is listed as galvanized steel with a black powder-coated finish.
Can it be used on a factory-built chimney?
Do not assume so. Factory-built systems commonly require specific listed terminations. Check the chimney manufacturer and model documentation.
Will it stop every chimney leak?
No. It may reduce direct entry through the top, but leaks can also come from the crown, flashing, chase cover, masonry or other defects.
Evidence basis: exact Amazon listing for ASIN B0F2SGZH4V and the supplied product images. Chimney Insight did not perform hands-on testing.