Fire Safety


Fire Protection And HVAC In The Climate Whiplash Era


Extreme temperature swings do not just strain HVAC equipment: they directly undermine a building’s passive fire protection. Facilities managers face a double challenge following the record- breaking heatwaves that scorched the UK in summer 2026, bringing May and June temperatures above 38°C. As autumn approaches, cooling networks that operated at maximum capacity must transition back to heating mode for winter.


Heating, ventilation and air conditioning (HVAC) networks


experience significant physical stress during this rapid shift from summer heat to winter freeze. Crucially, these systems intersect directly with a


building’s passive fire protection framework.


When heating and cooling systems are modified, overworked, or strained by thermal expansion, essential passive barriers are frequently compromised.


The Hidden Risk: HVAC As A Fire Highway


Passive fire protection relies on static, certified barriers – fire walls, floor slabs, dampers, fire stopping and fire doors – designed to contain fire and smoke within defined compartments.


HVAC networks, however, penetrate these barriers through


ductwork, pipework and risers. When these penetrations are inadequately protected, they create pathways through which fire and smoke can spread within minutes.


While routine inspections catch standard wear and tear, extreme weather events demand ad hoc reviews. Responsible Persons and Accountable Persons must take all reasonable steps to manage dynamic risks when unexpected climate shifts compromise structural integrity, even if building components met textbook requirements beforehand. Continuous oversight from a competent third-party accredited partner, like Crown Fire Systems, can flag systems failures and restore their integrity promptly.


Core Points Of Intersection


Facilities managers maintaining compliance under Approved Document B and BS 9999 must monitor three primary areas where HVAC meets passive structural defences:


1. Fire and Smoke Dampers in Ductwork Fire dampers sit inside air ducts where they pass through fire compartment walls. Under normal conditions, they remain open to allow climate-controlled air to circulate. When exposed to heat, a fusible link (typically melting around 72°C –74°C) or thermal actuator releases, snapping mechanical blades shut to block flames and smoke. Debris from high volume summer airflow can obstruct those damper blades. BS 9999 mandates inspection and drop-testing for all dampers at least annually.


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2. Penetration Sealing (Fire Stopping) Routing pipework for heat pumps, chillers, or hydronic heating through walls


and floors creates structural voids. Facilities


managers must verify that all gaps are sealed using certified fire stopping materials: • Intumescent Sealants and Mastics: Expand drastically when heated to close small gaps around metal pipework. • Intumescent Pipe Collars:Fitted around plastic condensation


lines. Heat melts the plastic while the intumescent compound swells inward, crushing the pipe shut to preserve the fire rating. • Fire-Rated Batts: Coated mineral wool boards used for effective fire stopping across larger multi-service openings.


3. Thermal Insulation Standards Insulation


surrounding chilled water or heating pipework


must meet strict Reaction to Fire standards (typically Class A1 or A2 under BS EN 13501-1). Substandard foam insulation acts as a fuse, spreading surface flames rapidly along vertical service risers.


Preparing Your Premises For Winter


As cooling demands drop and heating systems kick in, perform these key operational checks: • Inspect Dampers After Peak Cooling: Ensure high-volume summer airflow has not deposited debris that could jam damper mechanisms. • Audit Retrofit Work: Inspect areas where temporary cooling or heating units were installed during recent heatwaves. Ensure contractors did not breach fire stopping or alter surrounding infrastructure without proper reinstatement. • Check Structural Barriers: Examine all service penetrations


and verify that surrounding fire doors remain undamaged, latching correctly without warping from seasonal humidity changes. • Inspect Pipe Wraps Before Freeze Cycles: Thermal expansion can dislodge collars, creating unprotected penetrations. Verify that pipe collars and wraps are intact before full winter heating cycles begin.


Partner With Crown Fire Systems


Maintaining robust fire protection requires continuous vigilance, expert oversight and precise competent execution. Crown Fire Systems provides comprehensive fire protection services tailored to keep your building compliant and secure through every season. Whether you require specialist fire stopping solutions, expert fire door installation or routine maintenance of your existing passive fire protection infrastructure, our team helps strengthen your building’s passive fire resistance across changing seasons. Contact Crown Fire Systems today to book a passive fire system inspection.


For more information visit: https://www.crownfiresystems.co.uk/


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