Start with the powder. MAP stands for mono ammonium phosphate, and the number is the percentage of that active ingredient in the fill. Minimax fills its ABC units with silicon coated MAP powder at 50 percent or 90 percent as required, and the Minimax+ model comes with MAP 90 only. Where both are offered, compare the listed ratings for your size: the 4 kg gas cartridge unit is rated 3A:55B with MAP 50 and 3A:89B with MAP 90.
Next choose how the unit is pressurised. Stored pressure units hold dry nitrogen inside the cylinder with the powder, at an operating pressure of 15 bar. Gas cartridge units are pressurised from a separate gas cartridge when operated; Minimax recommends them for industrial use and severe, usually outdoor, conditions, and notes that they are quick and simple to refill after discharge.
Then match the size to the risk. Portable stored pressure sizes run 1, 2, 4, 6 and 9 kg, and gas cartridge sizes 4, 6 and 9 kg. For large open risks, the mobile type comes in 25, 50 and 75 kg with an external CO2 cylinder, rated 20A:233B. In a rating such as 3A:89B, the figure before A reflects the solid material test fire the unit put out and the figure before B the flammable liquid test fire.
For coastal or high salinity sites, choose the stainless steel body for its corrosion resistance. For receptions and display areas, the compact Minimax+ in 1 and 2 kg is designed to suit the look of the premises. FPS supplies, installs and refills every model on this page in Bhopal and across Madhya Pradesh.