Solberg Manufacturing | Filters, Silencers, Vacuum Filters, Oil Mist Eliminators, Separators

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ISO Flange Vacuum Filters

Wide variety of inlet vacuum filters with ISO-NW, -K Flanges

VTL Series, VTS Series

Vacuum Trap

SME Series

Oil Mist Eliminators


Product Spotlights, Demonstrations

WL Series

Medium to High Vacuum Filtration

DSV Series

Two Stage Discharge Filter

ACV Series

Advanced Crankcase Ventilation

Filter Silencers and Inlet Filters

Note: Please read the maintenance instructions given by the OEM for the machinery first. The OEM's manual should be adhered to in order to protect the equipment. Solberg Manufacturing, Inc has made every effort to make sure that these instructions are accurate but is not responsible for any typos, slight variations or for human errors that may occur.



Section A


The purpose of this manual is instruction on the proper assembly and care of Solberg inlet air filters.



This manual must be read and thoroughly understood before using and caring for this air filter. Failure to comply could result in explosion, product/system contamination or personal injury.


This manual should be used as a supplement to the user’s understanding of the proper care needed to maintain a safe and dependable air filter. It is the responsibility of the user to interpret and explain all instructions to persons who do not read or understand English BEFORE they are allowed to maintain and use this filter.

This manual should be readily available to all operators responsible for operation and maintenance of the inlet air filters.

We thank you for selecting products from Solberg Manufacturing, Inc. We are confident that our superior filter designs will meet your application requirements.



Section B


1. Identification of Solberg Inlet Air Filters.

All Solberg inlet air filters should have an identification label/nameplate that gives the following information:

Assembly Model #
Replacement Element #

(The exception is OEM supplied units. In this case, please enter the OEM part numbers below.)

Fill in the table in the attached document with actual nameplate data from your new Solberg inlet filter(s).

The model number designates the filter type, the original element configuration and housing connection size. For example, the part number in the attached document identifies the filter as being a ‘FS’ design filter with a 235 element with prefilter and 3” MPT connection size.

2. Filtration Rules of Thumb

General: For peak output performance from a compressor, blower, vacuum pump, engine, or any other machine that consumes air, one must have clean, unrestricted air. Proper filtration can help stabilize the working environment within rotating equipment even when the external conditions may be quite severe. A critical component in creating the right working conditions is filter sizing. With the properly sized filter, equipment will run smoothly over its entire expected operating life.

A major factor in filtration and filter sizing is air velocity through the filter media. Generally, the slower the velocity of air through a media the higher the filter efficiency and, conversely, the lower the pressure drop. Therefore, the primary goal in filter sizing is to optimize the velocity of air through the media (sometimes called face velocity).

Rule of Thumb #1: Always begin with the filter cartridge requirements when sizing a filter. Once the appropriate element has been selected then move on to the housing requirements.

Rule of Thumb #2: Always ask or specify a filter based on a micron rating with filtration efficiencies. As an example, stating a requirement for a 1-micron filter is misleading because no efficiency rating has been specified. A 1-micron filter at 95% efficiency may be less efficient than a 5-micron filter at 99% efficiency. For proper air system performance in light and industrial duty environments, a filter with a minimum of 99% filtration efficiency at 5 microns is required.

Rule of Thumb #3: Size your filter correctly by understanding the impact air velocity through a media has on efficiency and pressure drop. Maintain the suggested Air-to-Media ratios listed in the attached document based on the external environment listings and Filtration efficiency needs.

Rule of Thumb #4: Pressure drop is also caused by the dirt holding capacity of the element. As the element fills up with dirt, the pressure drop increases. It is important to document the pressure drop across a given filter when it is new and then clean or replace it when the pressure drop increases by 10” to 15” / 250-280mm H2O over the original reading.

Rule of Thumb #5: The inlet connection greatly influences the overall pressure drop of the filter system. To minimize the restriction contributed by an inlet filter, a velocity of 6,000 ft/min (10200m3/h) or less is suggested through the outlet pipe. The table in the attached document lists the suggested flows based on pipe size.

3. Element Specifications

Temperature Range: -15° to 220°F / -26° to 105°C
Filter Change-Out Differential: 10” to 15” / 250-380mm H2O Over Initial Delta P

Temperature Range: -15° to 385°F / -26° to 196°C
Filter Change-Out Differential: 10” to 15”/ 250-380mm H2O Over Initial Delta P

4. Element Cleaning-Inlet Filtration 

Solberg elements should be cleaned or replaced, once the pressure drop reaches 15 to 20 inches water column (380-500mm WC) above the initial pressure drop of the installation.

The decision to clean the element rather than replace it is left to the discretion of the operator.  Any damage which results from by-pass or additional pressure drop created by element cleaning is the sole responsibility of the operator. 



  • The overal performance of a filter element is altered once cleaned.
  • The initial pressure drop after cleaning will be greater than the original, clean pressure drop of the element.

  • After each subsequent cleaning, the initial pressure drop will continue to increase.
  • Under all circumstances, the initial pressure drop of the element needs to be maintained at less than 20 inches water column (500mm WC).

  • Cleaned elements that exceed 20 inches water column (500mm WC) at start-up should be replaced with new elements.

With many types of equipment, the maximum pressure drop allowed will be dictated by the ability of the equipment to perform to its rated capacity.  Under all circumstances, the operator should avoid exceeding the manufacturer's recommended maxium pressure drop for their specific equipment.

A. Polyester Element: The polyester element may be washed in warm soapy water, vacuumed, gently blown out or replaced. The element should be dry before reinstallation.  The element should be replaced after a maximum of three cleanings. 

B. Paper Element: The paper element may be lightly blown with low pressure air. It is disposable and in most cases should be replaced with a new element.

C. Polyurethane Prefilter: The prefilter may be washed as a sponge or replaced to give the element a longer service life.

D. Epoxy Coated Wire Mesh and Stainless Steel Wire Mesh Elements: Cleaning instructions similar to polyester, except mild solvents may be used.

E. Activated Carbon Element: Not cleanable

F. Polypropylene Element: Cleaning instructions similar to polyester

G. Nomex Cloth Element: Cleaning instructions similar to polyester

If you are not confident that the integrity of the element was maintained during cleaning, it is recommended that a new element be installed. Also, spare parts such as gaskets, wingnuts and washers can be supplied upon request.


Section C


1. Installation.

A. Maximum operating temperature for most Solberg inlet air filter products is 220°F / 105°C. Temperatures in excess of this could cause damage to elements, media and elastomers. High temperature products are available.

B. Direction of flow is typically from the outside of the element to the inside of the element. Most products have arrows indicating direction of flow on the inlet and outlet ports.

C. Ensure that pipe/flange connections are adequately sealed so the potential for leaks is reduced to a minimum.

2. Disconnecting canister top from canister base.

A. FS-04-06-10 (or 05-07-11): Twist top housing to open. Use care to support bottom housing while removing top housing. Fitting damage can occur if fitting is torqued in the wrong direction.

B. Small QB/FS/F/FT: Remove weather hood or top plate by loosening hex nut or wing nut and lifting off.

C. Large 2Q/QB/FS/F/FT: Remove cover by loosening hex nut or wing nut and lifting off.

3. Removing element for service/maintenance.

A. Carefully remove retaining hex head/wing-nut and washer over top plate, and then remove element. Note: Model “04-06-10” elements should be free when housing tops are removed.

B. Clean sealing surfaces of housing, top plates and element endcaps so that they are free of dirt or any other particulate.



Failure to comply with these instructions may result in system or equipment contamination.


4. Securing Element.

A. Place new or cleaned element evenly on base plate. Be sure element seats properly on base and there is no dirt or particulate present on sealing surfaces. With multiple element stacks place elements in line with base element and ensure elements seat properly.

B. Place top plate (if necessary) on element by centering on tap bolt.

C. Secure washer and wing nut to end cap (or top plate) and tap bolt. Element must be tightly secured. Note: Do NOT over tighten!



Defective installation may cause system or pump contamination. Use only genuine Solberg replacement parts.


5. Securing canister top to canister base.

A. Make sure all surfaces are free from dust and other particulate.

B. Small QB/FS/F/FT: Replace top plate and/or weather hood if necessary. Feed threaded rod into corresponding bolthole and tighten. Note: Do NOT over tighten!

C. Large 2G/QB/FS/F/FT: Replace cover. Feed threaded rod into corresponding bolt hole(s) and tighten. Note: Do NOT over tighten!

D. FS-04-06-10 (or 05-07-11): Reassemble top housing to bottom housing by aligning tabs and turning into place.

6. Equipment Startup.

A. Be sure to read the instructions on installation or element replacement as listed above before starting equipment.



If at any time the operator is unable to verify the integrity of the element or any housing feature, the factory or a regional representative should be contacted prior to startup.


B. Please check the listed steps prior to startup

    1. Check element to make sure it is properly on element base or sealing surface.



Failure to seat the element properly may result in contaminant by-pass resulting in damage to equipment.


    2. Check element top plate or cover to make sure it is seated properly on element.

    3. Check housing cover (if applicable) that it is installed correctly onto housing.

    4. Be sure all fasteners and hardware (if applicable) have been tightened.



If the air flow si reversed through a Solberg filter unit, be sure to check the element and housing internals for damage.  Failure to do so may result in damage to equipment.




Section D


1. Pressure drop readings are recommended to have an effective air filter. Always document initial pressure drop during start-up when element is clean. Replacement cartridge is needed when system experiences 10” to 15” / 250-380mm H2O above drop above the initial reading. Refer to page 4 for initial values.

2. Always check replacement cartridge gaskets to insure they are adhered uniformly along the end caps during handling. If not, contact Solberg Manufacturing, Inc. immediately. Do not modify or change!

3. Always check inlets/outlets, element base and its components when replacing element to insure cleanliness. Wipe clean if necessary.

4. Operate only when a proper seal exists.

FS Series 1/2"-6"MPT, Flange

FS Series 6" to 14" Flange

2G Series 3"-12"MPT, Flange

LQB Series 3"MPT-12" Flange

Sumo Class / Multibarrel

F Series 1/2"-6"MPT, Flange

F Series 6"-14" Flange

Sumo Class / Multibarrel

FT Series 1/4"-14"MPT, Flange

FT Series 1/4"-14"MPT, Flange

SpinMeister SM Series 1-1/2"-2-1/2"MPT

SpinMeister SM Series 3"-4"MPT, Flange

SpinMeister SM Series 6"-12" Flange

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Solberg Manufacturing is ISO 9001: 2008 Certified

Models, parameters, and specifications may change without notice.

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