Smoke alarms are not designed for garages and attics and are much more likely to fail than a heat detector.
Attic heat detector.
400 800 fpm 5 inches.
For most applications in homes and attached garages the hd135f can be used.
Another location in a home where you should have a heat detector rather than a smoke alarm is the attic.
The heat detector is rated at 194ºf 92ºc temperature.
For every additional 400 feet per minute of air velocity the heat gun to detector spacing should be reduced by one inch e g.
This item kidde hd200f heat detector for attic use kidde hd135f fyrnetics hardwire heat detector with battery backup hardwired heat alarm with battery backup brk brands hd6135fb.
If the code where you live requires a heat detection device in the attic you will need to use a spot type heat detector.
The us fire administration fema recommends that you have a heat detector rather than a smoke alarm in your garage.
800 1 200 fpm 4 inches etc.