1.1 These requirements cover emergency vault ventilators and vault-ventilating ports.

1.2 Emergency vault ventilators are primarily intended to provide fresh air to persons locked in the vault by accident or during a robbery.

1.3 Vault-ventilating ports are intended for connection to an outside ventilating system that provides circulating air while the vault is open.

1.4 These requirements are intended to establish burglary resistant ratings. The ratings, based on the net working time to effect entry, are as follows:

1. C1-30, minimum 30 min protection

2. C2-60, minimum 60 min protection

3. C2-90, minimum 90 min protection

4. C3-120, minimum 2 h protection.

1.5 When installed in a vault according to the manufacturer's instructions, the products covered by these requirements do not affect the burglary resistant rating of the vault.

1.6 These requirements do not cover protection against entry by attacks with a burning bar (thermal lance) or explosives.

1.7 These units are intended to be installed in accordance with the provision of the Canadian Electrical Code, C22.1. However, it is intended that inspection authorities having jurisdiction be consulted before installation of electrical connections.

1.8 Products covered by these requirements are intended for installation in vaults that are used for the storage of valuables, and that are protected by special security measures that cannot be forced using normal rescue equipment, but require waiting for a time lock or similar device to release entrapped individuals.