Equipment requirements and operating conditions
Extracting air from a kitchen creates a need for replacement air. When that supply is inadequate, doors can become difficult to open, cooking areas can feel draughty and an exhaust canopy may struggle to capture fumes consistently. We assess make-up air requirements alongside commercial kitchen extraction projects rather than treating exhaust fan selection in isolation.
How we scope the work
We review the intended exhaust arrangement, available outdoor air paths, neighbouring conditioned spaces and how staff experience the existing system. Excessive negative pressure may be caused by changes to fan duty or alterations to the building. The location and delivery pattern of replacement air can also affect cooking comfort and extraction capture.
Manufacturing, installation or service approach
Project work can involve discussion of dedicated supply fans, duct connections, ventilation coordination and modifications to existing arrangements. Where a kitchen is refurbished, we consider both the new cooking line and the rest of the building's air movement. HVAC equipment and exhaust extraction must be reviewed together when they influence each other.
Technical safeguards and limitations
Make-up air design must consider thermal comfort, fire-safety interfaces, building requirements and safe discharge of contaminants. We do not promise that installing an additional supply fan will fix every smoke problem without evaluating the source capture and exhaust route.
What to provide for a quotation
Share kitchen and exhaust equipment details, any drawings, observed pressure or odour complaints, and photographs of available air inlets. A site review may be needed to establish whether the problem comes from insufficient replacement air or the extraction system itself.
Discuss the scope with our technical team
Why exhaust systems need replacement air
An extraction fan moves air out of the kitchen; replacement air must enter through a suitable route. Insufficient provision can reduce capture, create drafts through doorways or affect comfort and appliance operation. We assess the relationship between extract volume, conditioned or unconditioned supply air, kitchen layout and the adjacent spaces.
Integration with canopy and HVAC work
Supply diffusers should not create air movements that disrupt the rising plume from the cooking line. The design discussion includes supply temperature, filter access, fan controls and coordination with mechanical services. When retrofitting an existing kitchen, we ask about doors, cooking changes and recent air-conditioning modifications as well as the extractor itself.
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Equipment and operating considerations
Kitchen exhaust without adequate replacement air can draw air through doors, interfere with combustion appliances and weaken canopy capture. We consider where outdoor air enters, how it is tempered and whether its discharge disrupts the rising cooking plume. The make-up air arrangement must be coordinated with the exhaust duty and building layout. A proposal should identify the cooking appliances, current fan and any pressure complaints. Detailed fire, gas and building requirements must be assessed for the specific installation.