Model Description H02-0312 SUNDSTROM SR 221 Pre-filters Protect particulate filter against early clogging by larger particles. H02-5312 SUNDSTROM SR 297 Multigas Filter Filter class 1, type ABEK Protect against organic gases, inorganic gases, acidic gases and vapours and ammonia. H02-2512 SUNDSTROM SR 217 A1 filters Filter class 1, type A. Protect against organic gases and vapour, with boiling points above +65ยบ C. Quick Inquiry Your Name (required) Your Email (required) Subject Your Message