ChamberMaxx Stormwater Chamber

Contech Engineered Solutions · CM-45

An open-bottom corrugated plastic subsurface stormwater chamber, installed in rows beneath parking lots and other light-duty paved areas to detain or infiltrate runoff. The manufacturer states each chamber provides 47 cubic feet of storage, that the chambers are manufactured per ASTM F2418, that end caps are integrated rather than loose, and that the chambers are structurally designed to exceed HS-20/HS-25 live loads per AASHTO LRFD design specifications. Written by this library from the manufacturer's own product page, not from marketing copy.

Contributes to 2 LEED credits

Compiled from public manufacturer data and not yet verified against a primary source. Confirm against the manufacturer\u2019s current datasheet before specifying.

View on manufacturer site →

Specifications

Size	45" x 85.4" x 30"
Storage	37 cu ft/chamber
Load Rating	H-20
provenanceStatus	FILL-OR-WITHDRAW - marked by lane C-db run 972, 2026-09-13. THIS ROW HAS NO source_url AND NO linkage AND IS THEREFORE NOT A LISTING. The status column cannot carry the marking - products_status_check permits only verified and unverified - so it is recorded here, which is the convention philips-astra-2x4 and trane-xr15 already use. NOTHING WAS DELETED. Two things resolve it and only two: (1) C-fetch retrieves a first-party page on the manufacturers own domain that names this exact model designation, or (2) it cannot, and the row is withdrawn. *** RUN 970 IS THE PRECEDENT AND IT IS A WARNING TO THIS PASS, NOT TO C-FETCH: bobrick-b1112 was held here as a FILL candidate, C-db run 258 spent a careful six-paragraph IBC linkage on it from stored evidence, and the model designation turned out not to exist in any Bobrick document. A SEED-ERA ROW WHOSE MODEL NUMBER HAS NEVER APPEARED IN A FIRST-PARTY DOCUMENT IS A WITHDRAW CANDIDATE, NOT A FILL CANDIDATE - so this pass deliberately built NO linkage on any source-less row, including rows whose stored designations do match a publishable clause (zurn-z1201 against UFGS 22 00 00 para 2.x(f) "Metallic Cleanouts: ASME A112.36.2M" and its finished-floor nickel-bronze cover clause, which is a clean two-limb match on stored evidence and IS DELIBERATELY NOT WRITTEN until a Zurn document is retrieved). THE ORDER IS SOURCE FIRST, THEN LINKAGE.

Certifications & Standards

ASTM F2418

What was checked, and what is deliberately not claimed

Db Pass Date: 2026-09-12
Db Pass Flag: fill-or-withdraw
Db Pass Note: Lane C-db run 852 sweep (c). NOT A LISTING UNDER THE PROVENANCE FLOOR: this row has NO source_url - nothing was ever retrieved for it from any host - and it had NO linkage when this pass began. Every designation it carries is a SEED-ERA CLAIM standing on nothing. The schema check constraint products_status_check permits only verified|unverified, so the literal status "fill-or-withdraw" could NOT be written; status is unverified per the protocol fallback and THIS FIELD carries the flag instead, so that the site and Lane C-fetch can both see it. NOT DELETED - fill or withdraw is a decision for Devin, and a retrieved first-party source would fill it. NOTE FOR C-FETCH: where acquired_from reads manufacturer-site on this row, that is a PROVENANCE CLAIM WITH NO SOURCE BEHIND IT and should not be trusted as evidence that anyone ever visited the manufacturer.
Db Pass Run Id: 852

Sustainability

Recycled Content

HDPE

LEED Contribution

MR: Building Product Disclosure & Optimization · MR: Sourcing of Raw Materials

Applies to Code Sections

Code sections where this product or product category is relevant. Click through to the viewer for full text and commentary.

EPA NPDESLEED SSc6