... fin painted or not8.suitable for R134A, R22, R404A, R407C refrigerant and so on9.pitch of holes and pitch of rows : 25*21 ... examination under 3.0Mpa air pressure to ensure the tightness.11.widely used in refrigeration industry and other cooling and heating system.12. ... fin, expanding, digressing, dryingWelding, leakage test, bending, inspection, packingNote: for further information please contact us.