1- Why This Little Motor Matters The average garage door opener lifts a 150 kg slab 1 000 times a year—more reps than your dishwasher, furnace blower, or treadmill. Yet most owners discover its value only when the panel refuses to budge. Our field manual flips that script, turning every reader into a calm commander of convenience, security, and silence. 2- Hardware Line-Up: Four Species at a Glance Species Native Noise Lifespan Connectivity Typical CAD Price Chain-drive AC 70 dB 12 yrs RF $350-$500 Belt-drive opener DC 55 dB 15...