What is a restriction listed under ANSI Z21.11.2a regarding the installation of appliances?

The restriction regarding the installation of appliances listed under ANSI Z21.11.2a pertains to the limitations placed on certain locations where these appliances may not be installed. Specifically, the installation of gas appliances in sleeping rooms is restricted due to safety concerns. This is because sleeping areas can pose unique risks such as potential carbon monoxide buildup and inadequate ventilation, which are critical for maintaining safe air quality.

In contrast, the other choices involve considerations that, while important, are not specifically dictated by ANSI Z21.11.2a as restrictions in the same way as the prohibition on installing appliances in sleeping rooms. For instance, appliances can often be installed in garages, provided they follow specific ventilation guidelines. The use of listed blowers and maximum BTU output specifications generally pertain to performance and safety standards rather than installation location restrictions. Thus, understanding the safety implications behind why gas appliances should not be installed in sleeping rooms is essential for compliance with industry standards and ensuring occupant safety.