Aluminum Alloy Lockable Access Panel 45 x 55 cm 18 x 22 in Durable, secure access panel designed for wall and ceiling inspection openings. Constructed with a thick aluminum frame and a honeycomb aluminum door panel for long lasting strength and sound reduction. The door surface is covered with a PET layer to resist moisture and aging. Key Benefits Durable construction: 3.5 cm (1 3/8 in) aluminum frame and 1.8 cm (3/4 in) aluminum honeycomb panel provide rigidity, resistance to deformation, and reliable performance over time. Improved insulation: PET surface layer helps reduce air transfer and resists moisture, extending service life in interior installation locations. Secure access: supplied with a key operated lock to restrict access to authorized personnel only. Simple installation: mounts with adhesive or screws with no special tools required. Designed for straightforward replacement or installations. Clear sizing guidance: nominal size 45 x 55 cm 18 x 22 in refers to inside diameter. Recommended hole should be about 5 mm larger than the inside diameter. Minimum installation depth greater than 40 mm 1 5/8 in. Features and Specifications Size: 45 x 55 cm 18 x 22 in (inside diameter) Frame thickness: 3.5 cm 1 3/8 in aluminum alloy Door panel: 1.8 cm 3/4 in aluminum honeycomb Surface finish: PET layer for air and moisture resistance Lock: key included for secure closure Installation: adhesive or screw mounting; hole should be 5 mm larger than stated inside diameter; installation depth greater than 40 mm 1 5/8 in Practical Applications Maintenance access: convenient inspection and maintenance access for plumbing, electrical, and HVAC equipment concealed behind walls or ceilings. Renovation and finishing: clean, secure cover for concealed junctions or utility spaces in residential and commercial interiors. Storage and service panels: secure small storage compartments or service hatches in utility rooms, corridors, and service areas. Installation Notes Measure the intended opening and ensure it is approximately 5 mm larger than the stated inside diameter for proper fit. Choose adhesive or screws depending on substrate type and load requirements. No specialized tools are required. Ensure installation depth exceeds 40 mm 1 5/8 in for correct panel engagement. This access panel combines sturdy aluminum construction and a lockable door to provide a practical, secure solution for interior maintenance and inspection needs.