- 447400HB
- 4DTS 300
- 4DTS 900
- 696400HB
- 696800
- H12 300HB
- H12 400HB
- H12 600
Shipping
Free U.S. shipping on every order
Dispatch
Ships same business day when ordered by 2pm ET
Fit
Fit guaranteed on the models listed
Returns
30-day returns
02Compatibility16 models · 1 part numbers · checked Oct 2026
Check your model.
Type what's printed on your unit's rating label. The list narrows as you type, and only models we've listed come back as a fit.
Replaces part numbers 1 listed
- 1051
It's on the rating label. Check the back, the base, or inside the filter door, and type the MODEL NO. line exactly as printed. The drawing is a guide; your label may sit elsewhere.
Fits these models 16 listed
Essick Air
- 4DTS 300
- 4DTS 900
- H12 300HB
- H12 400HB
- H12 600
- 696400HB
- 696800
- 447400HB
- 427300
- 4D7800
- H12AEUO
- H12AUKO
- H12CUKO
Bemis
- 697400
- 697500
- 96100
Looks similar, doesn't fit
- H12AUKP Uses a different filter.
Don't see your model? Compatibility not confirmed. Email support@thinkcrucial.com with the model number from the label before you order, and we'll tell you whether this fits.
Fit list checked Oct 2026 against manufacturer and parts-catalog sources
Brand and model names are used only to show compatibility. Think Crucial is an independent brand, not affiliated with those manufacturers.
03Spec sheetFrom the listing
The spec sheet.
- Fits
- 4DTS 300, 4DTS 900, H12 300HB, H12 400HB and 12 more
- Replace
- Every 12 months · Essick Air's H12 manual for its own air filter: replace at least once a year
- Replaces part no.
- 1051
- Made by
- Think Crucial (aftermarket, not affiliated with Essick Air)
04How it comparesNo brand price quoted
Think Crucial vs. Essick Air's own.
We only quote the other brand's price once we've checked it and can show you where.
| What | Think Crucial | Essick Air's own filter |
|---|---|---|
| Fits the models listed | Yes, listed and fit-guaranteed | Yes |
| Price | $36.99 with free U.S. shipping | Not quoted |
| If it doesn't fit | Prepaid return label, full refund, 30 days | Essick Air's own terms |
| Made by | Think Crucial | Essick Air |
Aftermarket means we make the part to fit the models listed. It isn't made by or affiliated with Essick Air. You get the same job done with our own build, and our fit guarantee on top.
05Install & replace
When to replace it.
06Reviews1 on this site
What owners say.
On thinkcrucial.com
07Questions5 answered
Before you order.
Shipping, returns and fit work the same on every product.
Q01Will it fit my machine?
It's listed for 16 models, from 4DTS 300 to 96100, and it replaces part number 1051. If your label shows a different model, compatibility isn't confirmed: email support@thinkcrucial.com with the model number before you order. If a listed model doesn't fit, we send a prepaid return label and refund you in full.
Q02Is this an original Essick Air part?
No. It's an aftermarket filter made by Think Crucial to fit the models listed. Think Crucial is not affiliated with Essick Air. We make what we sell.
Q03What if it doesn't fit, or I change my mind?
If it doesn't fit the model we list, we email a prepaid return label within 30 days of delivery and refund you in full; opened to test the fit is fine. Changed your mind? Return it unused in its original packaging within 30 days of delivery. The return label is free for these too.
Q04When will it arrive?
Shipping to U.S. addresses is free on every order. It ships the same business day when you order by 2pm ET, and arrives in 2–5 business days.
Q05Is there a subscription?
No. You buy one when you need one. Nothing renews and nothing auto-ships.
08Who makes this
We make what we sell.
Think Crucial started in 2007 at a family vacuum repair shop. Today we make aftermarket filters, bags and parts built to fit the machines you already own, plus our own descalers and cleaners. Most people can fit the part themselves. They just need the right one, and a way to check it first.
Counter notes
- Find the model number on the rating label
- Match it to the list on this page
- Not listed? Ask us before you order
Ready to order
Humidifier Air Filter for Essick Air 1051
Fits 16 Essick Air models
$36.99Free U.S. shipping
Fit guaranteed: prepaid return label if it doesn't fit the model we list. 30-day returns.
Full product description
About this item
1 PACK OF REPLACEMENT HUMIDIFIER AIR FILTER COMPATIBLE WITH ESSICK AIR PART # 1051. Fits Essick Air Models 4DTS 300, 4DTS 900, H12 300HB, H12 400HB, H12 600, 696400HB, 696800, 447400HB. This is the humidifier's air filter (Essick Air part 1051), not the wick (Essick Air part 1041).
SIMPLE TO INSTALL: Remove the old air filter and fit the new one as shown in your humidifier's manual.
WHEN TO REPLACE: Inspect the air filter regularly and replace it on the schedule in your humidifier's owner's manual.
THINK CRUCIAL makes aftermarket replacement humidifier air filters and stands behind the quality and workmanship of all our products.
This is a replacement for:
- Part no.1051
Fits the following Essick Air Evaporative humidifiers:
Think Crucial is an independent brand. Brand and model names are used to show compatibility only; this is an aftermarket part made by Think Crucial, not an original manufacturer part. Fit guaranteed: if it doesn't fit the model we list, we'll send a prepaid return label.
Also compatible with: Essick Air models 427300, 4D7800, H12AEUO, H12AUKO, H12CUKO; Bemis models 697400, 697500, 96100.
Brand and model names are used only to show compatibility. Think Crucial is an independent brand, not affiliated with those manufacturers.