FAQ | SFFILTECH

Application guidance for dust filtration, liquid filtration, and HVAC filter selection.

FAQ

When should a bag filter housing use 304 or 316 stainless steel?

The choice between 304 and 316 stainless steel should be based on the process fluid, chloride level, chemical concentration, operating temperature, cleaning chemicals, contamination limits, and required corrosion resistance. Grade 316 generally offers better resistance to chloride-related pitting and crevice corrosion, but it is not suitable for every chemical or temperature. Review all wetted components—not only the bag filter housing shell—including the basket, fittings, welds, and seal materials. Final material compatibility should be confirmed for the actual operating and cleaning conditions.

What factors determine the cost of an industrial bag filter housing?

The cost of an industrial bag filter housing depends on the housing material, size and number of filter bags, design flow, operating pressure and temperature, connection and closure types, surface finish, basket and seal materials, testing, documentation, quantity, and shipping scope. Optional instruments, valves, coatings, or code-related requirements can also change the quotation. Compare available industrial bag filter housings using the same operating conditions, material scope, accessories, and inspection requirements; housing size alone is not enough for an accurate price comparison. Provide the information needed for a filtration quotation for a project-specific review.

When should an industrial air filter be replaced based on pressure drop?

An industrial air filter should be evaluated for replacement when its measured differential pressure at normal operating airflow reaches the documented final-pressure-drop limit for the filter or system. Earlier replacement may be necessary if airflow becomes inadequate, the filter is damaged, wet, or contaminated, or process and hygiene requirements are no longer met. A universal pressure-drop threshold is not reliable because filter design, efficiency, fan capacity, and operating conditions vary. Trend readings over time and inspect pre-filters and instruments before deciding.

What is air-filter resistance, and how should pressure drop be compared?

Air-filter resistance is the pressure difference measured across a filter while air is flowing through it. For a meaningful comparison of industrial air filters, review pressure-drop data at the same airflow or face velocity, filter dimensions, efficiency class, media condition, and test method. Distinguish the initial pressure drop of a clean filter from the specified final pressure drop used for maintenance planning. A lower value alone does not show equivalent performance when filtration efficiency, airflow, or test conditions differ.

How should filter cleaning method and expected service life be reviewed?

Cleaning method and service life depend on the filter type, media, particle or solids characteristics, loading, airflow or flow, pressure differential, temperature, chemical exposure, cleaning intensity, operating cycle, and maintenance practices.

Service life should not be confirmed from material name alone. Buyers should provide the existing cleaning method, replacement history, failure observations, pressure records, operating schedule, photos, and performance target so construction and maintenance considerations can be reviewed for the application.

How do temperature, moisture, and chemical exposure affect filter media selection?

Temperature affects fiber stability, dimensional behavior, finishes, seals, and expected service life. Moisture, condensation, hydrolysis, oxidation, acids, alkalis, solvents, and other chemicals can also change the suitability of a filter material.

Buyers should provide normal and peak temperature, chemical names and concentrations, moisture conditions, exposure duration, cleaning method, pressure, and process composition. Compatibility is application-specific and should be reviewed together with the complete operating conditions before quotation.

How should buyers select a filter housing for flow, pressure, and connection requirements?

Filter housing selection depends on the liquid or gas, design flow, operating and design pressure, temperature, viscosity, solids loading, required filtration stage, compatible filter element, and acceptable pressure drop.

Buyers should provide the preferred material, housing type, bag or cartridge size, quantity of elements, inlet and outlet size, connection standard, seal material, installation space, closure preference, drawings, and certification or inspection requirements. The final configuration must be confirmed in writing before production.

What details are needed to identify a replacement filter cartridge?

Useful identification details include the overall length, outside and inside diameter, media type, micron rating, flow direction, core and cage construction, end-cap configuration, connector style, gasket material, and any visible labels or part numbers.

Clear photos of the complete cartridge, both ends, seals, labels, and the installed housing can reduce uncertainty. Buyers should also provide the liquid, flow, pressure, temperature, quantity, and performance issue so the replacement request can be reviewed before quotation.

How do buyers choose liquid filter bag material, micron rating, and ring style?

Material selection depends on the liquid composition, chemical compatibility, operating temperature, viscosity, solids loading, required retention, and whether surface or depth filtration is appropriate. Polyester, polypropylene, and nylon mesh serve different application conditions.

The requested micron rating, flow, housing model, bag size, ring or flange style, seal requirements, quantity, and disposal or cleaning preference should be provided. Final media, construction, dimensions, and suitability are confirmed before order acceptance.

What information is needed to select a dust collector filter bag?

Filter bag selection should begin with the dust type, particle characteristics, gas composition, normal and peak temperature, moisture, chemical exposure, airflow, pressure conditions, and required filtration performance.

Buyers should also provide the bag dimensions, top and bottom construction, cage details, installation method, cleaning system, current media, service history, quantity, and any drawings or photos. Final material, finish, construction, and operating limits are confirmed during technical review and quotation.

How are product discrepancies handled after delivery?

The buyer should notify SFFILTECH promptly and provide the order number, product label, photos, measurements, quantity affected, packaging condition, and a clear description of the discrepancy.

If the issue may affect safety or performance, the product should not be installed or used until the review is completed. The response and proposed resolution are based on the confirmed specification, inspection evidence, order terms, and applicable responsibilities.

What payment terms does SFFILTECH accept?

Available payment methods, deposit and balance requirements, currency, bank details, and required transaction documents are confirmed in the formal quotation or pro forma invoice for each order.

Buyers should verify the beneficiary information against the approved commercial documents before payment. No payment term should be assumed from a previous order unless it is reconfirmed in writing.