Every Metro nozzle is ordered with a fire department specified flow and pressure rating. Because the Metro nozzle has a fixed opening, once you supply the rated pressure to the inlet of the nozzle, you deliver the specified flow rate.

You always have the ability, intentionally or unintentionally, to under-pump or over-pump a nozzle to achieve different flow rates and pressures, however, the Metro nozzle can be easily changed in the field by removing the current flow washer, which is on the exit baffle of the nozzle and installing a new flow washer. Each washer has a different thickness based on the pressure and flow requirements.

If you’re using an external foam eductor, it’s important to ensure the nozzle’s flow rate matches the eductor’s flow rate for the best quality of finished foam. The Metro nozzle also offers optional aspirating tubes to achieve a higher expansion rate for finished foam.

Yes, and it is very common that a department’s initial attack package has a certain size smooth bore and a fog nozzle to hydraulically match that smoothbore.

Check the pressure and flow rating of your current smooth bore and make sure that pressure and flow rating match the Metro nozzle option you are trying to specify.

For example, a 7/8” smooth bore which delivers 160 GPM @ 50 PSI, the Metro nozzle model specified should also be 160 GPM @ 50 PSI, which would be TFT model number ME1V-226.