
Recommendations for internal bathroom ceiling ventilation fan?
The article addresses a common problem faced by landlords with internal bathrooms: bubbling ceiling paint and damp marks due to insufficient ventilation. A landlord, identified as 'Property Gal,' sought recommendations for efficient and quiet ceiling extractor fans for two rented flats, where current 'Envirovent silent ventilation fans' have proven inadequate. The core issue is preventing tenants from turning off the fans while ensuring effective moisture extraction to avoid property damage and potential health issues.
Various members of the landlord community offered advice. One suggestion included installing an 'in line' extractor fan in the loft space above the bathrooms, noting their superior airflow compared to standard units. Another recommendation focused on fans equipped with a humidistat, which automatically activate and run as long as the humidity levels are elevated, thereby ensuring consistent ventilation regardless of tenant action. The importance of selecting a quiet model, by checking dB levels on supplier websites like Screwfix, was also highlighted to prevent tenants from switching them off due to noise.
Several contributors emphasized the human element in ventilation effectiveness. One landlord suggested checking if the existing 'silent' fans could be hardwired or otherwise modified to prevent tenants from turning them off, proposing this as a cost-effective first step before replacing units. Another member, Helen, shared her personal experience as a tenant in a windowless bathroom, stressing that consistent fan usage, leaving the door open after showering, and proper towel management significantly reduce condensation and paint peeling, even with a basic extractor fan.
Technical advice included specific product recommendations, such as the Axflow iCON30 with a humidistat, known for its better flow curve. The impact of duct length on fan performance was also raised, with a reminder that quoted flow rates are often for 'free air' and do not account for duct loss. Before replacing fans, it was suggested to check existing fan settings, such as high/low speeds and overrun timers, recommending a minimum 15-minute overrun for bathrooms. Further investigation into the existing extractor ducting for tears or poor joints, and ruling out other leaks, was also advised.
Advanced solutions involved considering centrifugal timer models for better air propulsion over longer distances or around corners, potentially with added humidistat functionality. To ensure continuous operation, one member suggested bypassing the fan isolator switch and installing a blanking plate, making the fan always active when the light is on, and informing tenants it's a new regulation. Finally, the recommendation of a 'continuous running' fan with a 'boost' function activated by the light switch, powerful enough for the ducting length, such as the 'nuaire cyfan,' was put forward, with a strong emphasis on ensuring tenants cannot access the isolation switch to disable it. These suggestions collectively aim to tackle the problem of condensation and damp in internal bathrooms by improving fan efficiency, ensuring consistent operation, and addressing potential tenant behaviors.
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