are widely accepted as the industry standard. Each system provides all of the components necessary to install a complete audio door entry system; including a surface lock release as standard. These systems are available from a one way (model 901) up to any size.
Each 900 series system comprises
Surface Mounting
The SPA panels supplied in the 900 kits are a popular choice due to their high
durability, resistance to corrosion and low cost.
Cable requirements