Look up the right bag, liner or filter for VacuMaid SR-series and Titan TCS central vacuums, see where each number comes from, and check fit before you order.
Central vacuum bags are a strange purchase. You buy them once or twice a year, the unit lives in the basement or garage, and the old bag is usually full when you finally go looking for its number. Two bags can look almost the same in a photo and still not fit the same unit.
This guide is the quick lookup: which bag, liner or filter each VacuMaid and Titan power unit sold by Avon takes, where the number comes from, and what to check when you can't find it. It is based on VacuMaid's product pages and specification sheets and Titan's owner's manuals, checked October 16, 2026. Each listing links to its product page for the current price.
Key takeaways
- Order by the unit's model and the bag number, not by the photo. HPB1 and HPB2H are different formats, as are Titan's TDSAC91N and TDSAC93N.
- Some VacuMaid units take either bag. VacuMaid lists HPB2H as an option on the SR36 and SR38, and HPB1 as an option on the SR52.
- Inverted-bag and cyclonic units don't use a disposable bag by default. They have a permanent filter or a cartridge to clean or replace.
- A HEPA-style bag is not a sealed HEPA system. It describes the bag, not the whole installation.
- Change the bag before it's packed. VacuMaid says no more than half full, or as soon as suction drops.
Where do I find my central vacuum's model and bag number?
On the power unit itself. Most units carry a rating label with the brand and model, and many disposable bags have their number printed on the collar or the pack. Check these places, in this order:
- The label on the power unit. Look on the side or back of the main body. Write down the full model (for example "SR52" or "TCS4792").
- The bag you're replacing. The collar or the bag itself may show a number such as HPB1 or HPB2H.
- The owner's manual. VacuMaid's specification sheets list the replacement bag by part number, and Titan publishes its manuals online.
- The old bag pack, if you kept it. The reorder number is usually on the front.
Switch the unit off before you open it, as both makers' instructions say. If the label is worn, painted over or hard to reach, take a photo of the unit and the bag collar and send it to us. That is usually enough to identify it.
Which bag does each VacuMaid disposable-bag unit take?
VacuMaid's four current disposable-bag units at Avon use two bag formats. The standard bag is the one VacuMaid's specification sheet names as the replacement. The optional bag is the one VacuMaid's product page says can also be used.
| Power unit | Standard bag | Optional bag | Avon listing |
|---|---|---|---|
| VacuMaid SR36 | HPB1 | HPB2H | HPB1 3-pack |
| VacuMaid SR38 | HPB1 | HPB2H | HPB1 3-pack |
| VacuMaid SR52 | HPB2H | HPB1 | HPB2H 3-pack or single |
| VacuMaid SR66 | HPB2H | Not listed | HPB2H 3-pack or single |
HPB1 or HPB2H: what's the difference?
VacuMaid describes the HPB1 as a three-layer nonwoven bag with a microliner, rated at 98.4% dust retention to the DIN 44956 test. It measures 10 by 25½ inches flat. The HPB2H is a five-layer, 7-gallon HEPA-style bag that measures 27 by 12 inches flat. VacuMaid suggests the HPB2H when more filtration is wanted.
On an SR36 or SR38, choosing between them is up to you: HPB1 is the standard bag, and HPB2H is VacuMaid's optional upgrade. The SR52 works the other way around, with HPB2H as the standard and HPB1 as the option. For the SR66, VacuMaid names only the HPB2H.
One caution: "HEPA-style" describes the bag media. It doesn't make the whole installed system sealed HEPA, because the piping, inlets and exhaust all play a part. If filtration is the reason you're asking, our VacuMaid guide covers venting and filtration.
VacuMaid HPB1 3-packStandard bag for the SR36 and SR38.
VacuMaid HPB2H 3-packStandard bag for the SR52 and SR66.
VacuMaid HPB2H singleOne bag, when you only need one.
Older VacuMaid, AstroVac and Valet units
VacuMaid's bag pages also list older and related models. VacuMaid names the HPB1 for the H1P, P70, SR36C, P80, H2, P73, P75, MK1P, MKXXIIIBP and HV101 Hairvac, and for the Valet AT100 and AT120. It names the HPB2H for the SR52H, SR760, SR800, all VacuMaid Garage Vacs and the Valet ATQ300, and as an alternate bag for the AstroVac SR36C, SR36, SR50 and SR52. If your model isn't on either list, check the unit's label or send us a photo before ordering.
Do VacuMaid inverted-bag units need replacement bags?
Not usually. VacuMaid's inverted-bag units collect dirt in a canister below a permanent filter, called the inverted bag, which you clean rather than throw away. VacuMaid says to clean it about three to four times a year, or every time you empty the canister. Our bag and filter guide links to VacuMaid's cleaning steps.
There are three parts you might still need, each one specific to a canister size:
| Power unit | Canister | Replacement inverted filter |
Plastic canister liner |
|---|---|---|---|
| VacuMaid SR14 | 27 qt | RB18W (12" can) | PB12MK |
| VacuMaid SR46 | 27 qt | RB18W (12" can) | PB12MK |
| VacuMaid SR60 | 38 qt | RB24W (14" can) | Not listed |
| VacuMaid SR62 | 38 qt | Not listed | Not listed |
| VacuMaid SR64 | 38 qt | RB24W (14" can) | PB-14MK |
- Replacement inverted filter. Needed only if the permanent filter is torn or worn out. Avon doesn't list the RB18W or RB24W online, so call or message us to order one.
- Plastic canister liner. Liners make emptying the canister cleaner. They aren't a filter, and they don't replace the inverted bag. VacuMaid lists the PB14MK for the SR64 (and the older SR54) and the PB12MK for the SR14 and SR46, among others. Avon lists the PB-14MK 4-pack; ask us for the PB12MK.
- Paper-bag option. VacuMaid says the SR14 and SR46 can use a sealed paper bag with an optional special stem. The bag needs that stem to seal, so ask us which stem and bag your unit needs before converting it.
"Not listed" means VacuMaid's pages that we checked don't name a part for that unit. It doesn't mean there isn't one. Send us the model and a photo of the canister and we'll confirm.
Which bag or filter does each Titan central vacuum take?
Titan's current power units come in two designs. The TCS4792, TCS7702 and TCS9902 are hybrids that can run with a disposable bag or, after the conversion described in the manual, without one. The TCS5525 and TCS8575 are filtered cyclonic units that use a cartridge filter and no bag.
| Power unit | Collection | Bag or filter | Where the number comes from |
|---|---|---|---|
| Titan TCS4792 | Hybrid: bag or bagless |
TDSAC91N bag | Avon listing* |
| Titan TCS7702 | Hybrid: bag or bagless |
TDSAC93N bag | Avon listing* |
| Titan TCS9902 | Hybrid: bag or bagless |
TDSAC93N bag | Avon listing* |
| Titan TCS5525 | Filtered cyclonic |
Cartridge 8106-01 | Titan manual |
| Titan TCS8575 | Filtered cyclonic |
Cartridge 8107-01 | Titan manual |
* Titan's owner's manual for these three models says to use only genuine TCS replacement bags but doesn't print a bag number. The TDSAC91N and TDSAC93N references are the ones Avon lists for each unit. Please confirm against your unit's label before ordering, or send us a photo.
- TDSAC91N and TDSAC93N are not interchangeable. The TCS4792 takes the TDSAC91N. The TCS7702 and TCS9902 take the TDSAC93N.
- Running a hybrid without a bag takes the conversion described in the manual, not simply leaving the bag out.
- Cyclonic units need their cartridge. Titan's manual says to change the cartridge filter once a year and to empty the dirt canister when it's two-thirds full. Avon doesn't list the 8106-01 or 8107-01 cartridges online; ask us to order one.
- Older Titan TCS5702 and TCS6602 units can use an optional filter bag with the adaptor that came with the unit. Avon lists the T505 bag for those two models.
Shop all central vacuum bags or the Titan bag collection.
Two bags look the same. Will either one fit?
Don't count on it. A bag seals against the inlet with its collar, and the collar's shape and size are what matter. Several details separate bags that look alike in a photo:
- The collar: its shape, its hole size, and any notches or tabs that lock onto the inlet.
- The flat size: for example, VacuMaid's HPB1 is 10 by 25½ inches and the HPB2H is 27 by 12.
- The layers: a three-layer bag and a five-layer bag filter differently.
- The pack: make sure the listing is for disposable bags, not a liner or a reusable filter.
Don't tape, trim or reuse a disposable bag to make it fit. If the bag doesn't seat the way the manual shows, it's the wrong bag.
How often should I change a central vacuum bag?
When it's half full, or sooner if suction drops. VacuMaid's guidance is to replace its bags at no more than half full, or whenever you notice a lack of suction. A bag packed with fine dust slows airflow at every inlet in the house, even when it looks only part full.
If you change the bag and suction is still weak everywhere, the bag wasn't the only problem. Our guide to central vacuum suction loss at one inlet or every inlet covers the next checks. Don't open the unit's wiring or the wall piping yourself; those jobs need service.
Checklist before you order bags
- Write down the brand and full model from the power unit's label.
- Note the bag number from the old bag or its pack, if it's there.
- Match both to the tables above, or to your owner's manual.
- Decide whether you want the standard or the optional bag, where the maker offers both.
- For inverted-bag or cyclonic units, check whether you need a filter, a liner or nothing at all.
- Order more than one. A 3-pack means the next bag is on the shelf when this one fills.
- If anything doesn't match, take photos of the label and the bag collar and send them to us before ordering.
Central vacuum bag questions
Can I use an HPB2H bag in my VacuMaid SR36 or SR38?
Yes. VacuMaid lists the HPB2H HEPA-style bag as an optional bag for both. The HPB1 paper bag is the standard replacement.
Can I use HPB1 bags in my SR52?
VacuMaid's SR52 page says the SR52 takes the HPB2H, "or use with optional HPB1." For the SR66, VacuMaid names only the HPB2H.
Does a HEPA-style bag make my central vacuum a HEPA system?
No. It describes the bag's filter media. How well the whole system filters also depends on the power unit, the piping, the inlets and whether the exhaust is vented outside.
My VacuMaid has an inverted bag. Do I need to buy bags?
No. The inverted bag is a permanent filter that VacuMaid says to clean about three to four times a year. You'd buy a replacement only if it's damaged, and plastic canister liners are optional.
Are Titan TDSAC91N and TDSAC93N bags the same?
No. Avon lists the TDSAC91N for the TCS4792 and the TDSAC93N for the TCS7702 and TCS9902. Match the bag to the model on your unit's label.
My central vacuum isn't VacuMaid or Titan. Can you help?
Often, yes. Send a photo of the unit's label and the old bag, and we'll tell you whether we have the right bag. Avon Vacuums also repairs central vacuums of all makes throughout Connecticut.
Sources: VacuMaid product pages for the SR36, SR38, SR52, SR66, SR14, SR46, SR60, SR62 and SR64, and their specification sheets; VacuMaid's HPB1, HPB2H, RB18W, RB24W, PB12MK and PB14MK pages and inverted-bag maintenance page; Titan owner's manuals for the TCS4792/TCS7702/TCS9902, TCS5525/TCS8575 and TCS5702/TCS6602 (all checked October 16, 2026). Titan bag references TDSAC91N, TDSAC93N and T505 are from Avon's product listings.
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