Ventilation: Open-Flued Boilers | TomKat Digital Workbook

Follow the air supply to an open-flued boiler. This focused TomKat workbook shows how the calculation changes when the same boiler is in a room, in a compartment supplied directly from outside, or in a compartment supplied from a room.

£3.99 digital PDF download. No printed booklet or postage.

No LCL manual purchase required. The explanations, figures and practice examples you need to work through this booklet are included.

What it covers

• Domestic natural-gas open-flued boiler examples.
• Heat input, output, net and gross ratings.
• Room ventilation and high- and low-level compartment vents.
• Worked drawings of vents in series and the 50% increase for the internal wall vents in those examples.
• Choosing a vent by its stated equivalent free area.
• A practice exercise with separate answers, plus a QR link to the TomKat ventilation calculator.

This is a focused learning workbook, not a complete ventilation lesson, installation procedure or assessment of competence. It does not cover every appliance or installation. Follow current standards, the appliance manufacturer’s instructions and the requirements for the job.

Download and use

16 A4 pages, including two notes pages and the resource-use notice. Five fillable answer boxes: save your own copy and use a PDF reader that supports forms, or print and write by hand. The boxes do not calculate or check answers. Your download link is provided after payment.

Corrections and future editions

If we identify an error in a digital booklet you purchased, we’ll provide a corrected digital copy at no extra charge. Your purchase does not include every future edition: expanded editions containing additional teaching material may be sold separately. Purchasing an expanded edition is optional. This does not affect your statutory rights.

Individual licence

This purchase is for one person, for their own learning and reference. You may save the PDF on your own devices and print copies for your own use. Except where permitted by law, sharing with learners, uploading to a training platform, or displaying or reproducing this workbook for classroom teaching requires a separate TomKat licence. No resale or redistribution.

For team or classroom use, contact info@tom-kat.co.uk.

Version 1.0, 6 November 2026. Original TomKat explanations, illustrations and design. Based on the applicable rules in BS 5440-2:2023; no LCL reference tables are reproduced. © 2026 TomKat Gas Training Ltd. Third-party rights remain with their owners.