Crownwell is a Pudong assembler/OEM with an English buyer site. Oil-injected screw, oil-free and portable diesel are three RFQs. Air treatment is not listed as a compressor SKU.
Crownwell rows published here: Oil-injected screw air compressor; Oil-free air compressor; Portable air compressor. Those names come from official product pages. Nameplate kW, bar(g) and FAD are confirmed on the RFQ — they are not typed in from a brochure photo.
A coalescing filter on an oil-injected machine does not make it a Crownwell oil-free quote. Shanghai public oil-free / clean-air rows: Oil-injected screw air compressor; Oil-free air compressor; Portable air compressor. ISO class stays on the paper, not in the headline.
Food / pharma air for Crownwell: ISO 8573-1 class on the paper, not a brochure adjective. Dryer and sterile-air extras stay on the RFQ. Named works: Shanghai. Duty-sheet prompts used on this desk: ISO 8573-1 class at package outlet or after treatment; Dryer and sterile / sterile-housing filter; Washdown, filling line or clean-utility duty.
Do not treat “compressor, China” as a Crownwell RFQ. Architecture (screw compressor) and the Shanghai works belong on the first line.
A buyer comparing Chinese screw compressor factories should treat Crownwell as one works in the Shanghai cluster, not a warehouse brand. FOB port and inspection window are named on the quotation.