How VentTools controls manufacturer data
Every enabled fire-damper calculation must identify its product, tested method, dimension reference and source status. Where those cannot be established, VentTools shows a review warning or refuses to calculate.
What “verified” means here
A verified VentTools method has enough published information to follow the complete path from the selected damper to the opening result. It does not mean that VentTools has certified the product or replaced the manufacturer. It means the calculation record identifies the controlling geometry and keeps the official source available for checking.
| Status | Meaning |
|---|---|
| Verified | The selected product and method have a mapped source, size rule and opening chain suitable for the displayed result. |
| Review required | Some guidance is available, but a source conflict, missing casing datum or method-specific detail prevents a fully issueable record. |
| Calculation locked | VentTools will not create an opening from another product's rule or from an unsupported extrapolation. |
The verification chain
- Identify the exact family: similar product codes remain separate records.
- Select the tested installation method: wall, floor, batt, mortar, frame and remote methods are not interchangeable.
- Establish the geometry reference: nominal duct, outside casing, PTC shroud or installation frame.
- Apply the published opening rule: fixed allowance, permitted range or exact table.
- Map lining and setting out: reveal lining is separated from face pattress, batt and infill.
- Attach source and limitations: the result carries the document reference, revision status and critical installation notes.
Manufacturer and product coverage
| Manufacturer | Mapped product families | Current position |
|---|---|---|
| BSB | FSD-TD-S, FSD-TD-C, FD-C-AF, FD-C, FSD-C, MFD-IC, AT-FSD | Structured Methods are separated by product and tested construction. FSD-TD-O remains review-required without a complete orderable flat-oval table. |
| Actionair | CSS, DWFX-F, HEVAC/HVCA installation frame, SPAN | Method-specific Measured casing, PTC-shroud and installation-frame references are kept distinct. Unsupported masonry rules remain guidance-only. |
| Lindab | FNC1, FNC1U, WH25, WH45, WK25, WK45, WKS25 | Controlled FNC1U remains locked pending its controlling manual. A WKS25 source discrepancy stays visible in the audit. |
| Advanced Air | 0160, 0400MAN/FME, 0500MAN/FME, 2530, 26SCD | In progress Opening tables and AFS ranges are mapped, but Project Pack enablement remains method-specific until every setting-out datum is established. |
Examples of controls that prevent a wrong result
Similar BSB circular product names
FD-C-AF, FD-C Series and FSD-TD-C are separate calculation paths. FD-C-AF uses a circular spigot through a rectangular curtain-blade casing and Angle Frame. It must not inherit the FSD-TD-C multiblade casing table simply because a diameter is the same.
Nominal duct versus casing edge
The bottom structural cut is calculated from the selected method's casing projection, clearance and lining—not from an assumption that the casing ends at the nominal duct edge.
Published ranges versus invented centre positions
Where a manufacturer permits a range of edge clearances or non-central positioning, VentTools stores those constraints separately. A convenient midpoint is not presented as a manufacturer requirement.
Conflicting source documents
The Lindab WKS25 Type A opening is shown differently in two supplied documents. VentTools retains the conflict and identifies which controlling installation booklet supports the live provisional method rather than hiding the discrepancy.
What each calculation record should show
- Manufacturer, product family and selected tested method.
- Nominal duct or entered measured reference.
- Overall casing or installation-frame stage where published.
- Finished aperture and permitted range.
- Structural hole and any separately added reveal lining.
- Bottom and top setting-out offsets only where the source supports them.
- Supporting construction, penetration seal, duct connection, supports and access notes.
- Official manufacturer source link and verification status.
Release and correction record
| Date | Release | Engineering change |
|---|---|---|
| 29 Aug 2026 | V2.0.8 | Added privacy-balanced organization authorship, original model-identification aids, an always-visible dimension chain and a review control for alternative reveal-lining thicknesses. |
| 29 Aug 2026 | V2.0.7 | Published the verification method as static, crawlable content; retained V2.0.6 calculation logic and added author accountability. |
| 26 Aug 2026 | V2.0.6 | Improved offset controls and wording without changing recorded bend tables or calculation formulae. |
| 21 Aug 2026 | V2.0.5 | Added the separate BSB FD-C-AF path, including verified Ø355 and Ø560 geometry. |
The underlying structured records remain available for technical inspection:
Controlling documents and corrections
VentTools is independent and does not certify products or installations. The current manufacturer IOM, Declaration of Performance, approved fire strategy, supporting construction and project-specific detail always take precedence.
Report a possible error to info@venttools.com with the damper label, product, selected method, source revision and entered dimensions.