Guided domestic gas appliance ventilation support for open-flued, room-sealed and flueless appliance scenarios.
A) Appliance Arrangement & Details
Select the appliance scenario. This assistant provides calculation support and guidance prompts. If the rating is gross, it converts it to net by dividing by 1.11. Always check manufacturer instructions and current guidance before making a final judgement.
Mixed Appliance Comparison
Enter each appliance separately. The assistant calculates each requirement and selects the largest free area. Do not add unlike appliance types together.
Appliance 1
Appliance 2
For a single appliance, enter the appliance input. For multiple appliances of the same type, enter the total combined net input. For different appliance types, calculate each type separately and use the largest requirement.
B) Installation Details
For room installations, the assistant gives single-vent guidance where applicable. For compartments, high and low level ventilation is shown.
C) Site Conditions & Warnings
Use these only where they apply. These help flag real-world factors such as vents in series, internal air paths and extract ventilation. Some items may trigger warnings rather than changing the calculation.
Results
Date/time generated
Appliance input used
Ventilation guidance
Required free area guidance
Vent position guidance
This assistant supports calculation checks and guidance prompts only. Results must be interpreted by a competent person in line with current guidance, manufacturer instructions, site conditions and professional judgement.
Disclaimer:
This tool is provided as guidance only and is intended to support domestic gas appliance ventilation training and calculation checks. It does not replace formal training, manufacturer instructions, current standards, site-specific assessment, or professional judgement. Results must be interpreted by a competent person in line with current guidance and safe working practices. No liability is accepted for any loss, damage or incorrect use arising from reliance on this tool.
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