Dryer Vent Cleaning & Periscope Replacement - Sunnyvale, CA

## Critical Safety Upgrade Completed in Sunnyvale Home Our team responded to a residential dryer vent cleaning service call in Sunnyvale and discovered a serious safety issue that required immediate attention. The existing dryer connection utilized an old periscope-style transition duct that was completely clogged with lint and improperly connected. These accordion-style periscope ducts are no longer permitted in residential installations due to their tendency to trap lint and create fire hazards. ## Professional Cleaning and Code-Compliant Replacement The periscope duct showed signs of significant lint accumulation and was connected with an unusual foil tape that compromised the seal integrity. We completely removed the non-compliant transition duct and performed a thorough cleaning of the entire exhaust system using professional rotary brush equipment and compressed air. The lint buildup was substantial, which explained why the homeowner was experiencing extended drying times and reduced dryer efficiency. ## Fire-Rated Transition Duct Installation Following the comprehensive cleaning, we installed a new fire-rated rigid transition duct manufactured by Innovate (model 2158A). This replacement meets current IRC M1502 requirements for dryer exhaust systems and provides superior airflow characteristics compared to the old periscope design. The new transition duct was properly secured with metal clamps and positioned to maintain the required clearances for optimal performance. ## Restored Safety and Efficiency The completed work restored proper airflow to the dryer exhaust system, eliminating the fire hazard posed by the clogged periscope duct. The homeowner can now expect normal drying times and improved energy efficiency from their dryer. We recommend annual professional cleaning to maintain optimal performance and safety compliance in accordance with NFPA guidelines.