FRL units
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| marking | WH-SMF1-1/4 | | description | Submikrofilter - Baugröße 1 | | match code | WH-SMF1-1/4 | | catalogue | Timmer 2001 | | page | kA | | |
| marking | WH-SMF1-3/8 | | description | submicro filter - installation size 1 | | match code | WH-SMF1-3/8 | | catalogue | Timmer 2001 | | page | kA | | |
| marking | WH-AKF1-1/4 | | description | activated carbon filter - installation size 1 | | match code | WH-AKF1-1/4 | | catalogue | Timmer 2001 | | page | kA | | |
| marking | WH-AKF1-3/8 | | description | activated carbon filter - installation size 1 | | match code | WH-AKF1-3/8 | | catalogue | Timmer 2001 | | page | kA | | |