Flue Terminal Clearances
Stop manually calculating clearances for flue terminals. Easily verify dimensions and clearances for open, perimeter, roof, and balcony flue terminals with mathematically verified precision.
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Why Professionals Use This Tool
Ensure compliance with AS/NZS 5601.1 by instantly verifying minimum clearances for flue terminals to prevent exhaust gas reentry and hazards.
What GasCalc Computes
Minimum Clearances: Computes required distances from flue terminals to openings, doors, windows, and boundaries.
Location Verification: Checks specific constraints for roof, wall, balcony, and perimeter installations.
Strict Adherence to Standards
Comprehensive Checks: Automates compliance checks against AS/NZS 5601.1 rules.
Fail-safes: Highlights violations and ensures the safety of your designs.
Inspector-Ready Reports
Digital Audit Trail: Generate precise, standardized PDF reports to prove compliance to regulators.
Paperless Workflow: Keep all your compliance documentation organized on any device.
Navigating AS/NZS 5601.1 Clause 6.9 Requirements
Proper flue termination is critical to prevent downdraughts and ensure exhaust gases safely disperse. GasCalc helps you navigate these complex rules instantly.
Open Flues & Adjacent Structures
Terminals must be positioned to avoid wind-induced downdraughts. Depending on their distance from neighboring structures, specific height requirements apply. They also require minimum clearances from building openings and other terminals.
GasCalc checks these distances automatically.
Above-Roof Terminations
Terminating above a roof involves strict minimum heights from the roof surface itself, as well as nearby chimneys. If the roof is accessible for personal or public use, these height requirements increase significantly to ensure safety.
Easily input your roof type to verify compliance.
Balconies & Covered Areas
Terminals under covered areas or on balconies require careful positioning to ensure combustion products disperse properly. The rules change based on the number of open sides and whether it's a recess or a balcony, often necessitating fan-assisted appliances.
GasCalc determines the exact layout requirements.
Roof Spaces
The standard explicitly prohibits locating flue terminals within a roof space under any circumstances to prevent hazardous gas accumulation.
Avoid costly rework by checking constraints early.
Clearances Around a GMS (New Zealand Only)
For installations in New Zealand, specific clearances are required between flue terminals and Gas Meters. The required distance scales up for high-capacity systems to prevent combustion products from affecting the GMS or entering the appliance's combustion air.
GasCalc handles region-specific logic seamlessly.
How the Calculator Works
Convert complex regulatory requirements into a fail-safe digital workflow.
Select Terminal Type
Choose between wall, roof, perimeter, or balcony flue terminals.
Map Dimensions
Input the dimensions and distances to nearby structures and openings.
Check Clearances
Verify if clearances meet AS/NZS 5601.1 safety guidelines.
Compliance & Standards
AS/NZS 5601.1:2022: Complete coverage for Flue Terminal Clearances to ensure exhaust gases safely dissipate away from building openings.
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