Air comfort replacements can be confusing when the names sound related but the component roles are entirely different. The useful shortcut is to start with the part number and the named role: a wall sleeve serves a different purpose from an air filter, while a display box assembly is another distinct component. Price matters, but the intended series or model references should lead the decision.
Quick take
- Choose the Comfort-Aire EA448F Wall Sleeve for the specifically stated BG-xxx and BGE-xxx Series air conditioner use case.
- Choose between the two filters by exact identifier: 12100204000202 and 12120300005844 are separate replacement part numbers, and the latter is described as a 7-1/2-inch by 13-inch air filter.
- Choose the 17220300A17150 Display Box Subassy Box when a display box assembly is the named replacement need for the associated Comfort-Aire REG models.
- The listed prices span from small replacement filters to a larger wall-sleeve component, so compare role and fit references before comparing cost.
Listed price comparison
| Product | Listed price | Price position |
|---|---|---|
| Comfort-Aire EA448F Wall Sleeve 25-7/8"W x 15-17/32"H x 16-23/32"D BG & BGE | USD 134.99 | |
| Comfort Aire Air Conditioner Part # 12100204000202 - Filter | USD 12.61 | |
| Comfort Aire Air Conditioner Part # 12120300005844 - Air Filter | USD 13.53 | |
| Comfort Aire Air Conditioner Part # 17220300A17150 - Display Box Subassy Box | USD 42.17 |
Decision matrix
Need a sleeve for a BG-xxx or BGE-xxx Series air conditioner? The EA448F is described for use with those series and is the only wall sleeve in the comparison.
Replacing a filter with part number 12100204000202? Select the filter carrying that exact number. Its alternate identifiers include MDA12100204000202 and CMF12100204000202.
Need a 7-1/2-inch by 13-inch air filter? Select part number 12120300005844, which is explicitly described with those dimensions and associated with models including Comfort-Aire R-51L and RG-51J.
Replacing a display box assembly for a Comfort-Aire REG-series model? The 17220300A17150 display box assembly is associated with models including REG-123L, REG-123M, REG-183J, and REG-81L.
Product notes
Comfort-Aire EA448F Wall Sleeve
Choose the Comfort-Aire EA448F Wall Sleeve when the project specifically calls for a sleeve to use with BG-xxx and BGE-xxx Series air conditioners. Its metal construction, grille feature, and folding design make it the clear role match for that named setup. The stated dimensions are 25-7/8 inches wide, 15-17/32 inches high, and 16-23/32 inches deep. At USD 134.99, it carries the highest listed price in this comparison. The limitation is its focused role: the EA448F is a wall sleeve rather than either of the filter replacements or the display box assembly.
Comfort Aire Part # 12100204000202 Filter
If part number 12100204000202 is the target, the Comfort Aire Filter is the direct identifier match. Alternate references including MDA12100204000202 and CMF12100204000202 provide additional matching points, while the description associates the filter with examples such as Comfort-Aire REG-123J, REG-123H, REG-123M, and REG-81J. Its USD 12.61 listed price is the lowest among the four entries. Its limitation is straightforward: this is a filter replacement, so it does not fill the wall-sleeve or display-box role covered by the other named components.
Comfort Aire Part # 12120300005844 Air Filter
The Comfort Aire Part # 12120300005844 Air Filter is the focused choice when a 7-1/2-inch by 13-inch filter is called for. Beyond the title's air-filter role, the description connects this part to Comfort-Aire models including R-51L, RG-51J, RG-51M, RADS-51L, and RADS-61H. The listed price is USD 13.53. Its key limitation is also its defining selection point: the stated dimensions and model associations make it a specific replacement target, rather than an alternative to the 12100204000202 filter simply because both are filters.
Comfort Aire Part # 17220300A17150 Display Box Subassy Box
Select the Comfort Aire Part # 17220300A17150 Display Box Subassy Box for a named display-box assembly replacement. The description also links it with identifiers such as 17220300A01677 and CMF17220300A01677, and it names Comfort-Aire REG-123L, REG-123M, REG-183J-20A, REG-183L, and REG-81M among its associated models. At USD 42.17, its listed price sits between the filter entries and the wall sleeve. The limitation is that this assembly addresses a display-box need, not air filtration or the BG/BGE wall-sleeve use case.
Final recommendation by use case
For a BG-xxx or BGE-xxx Series wall-sleeve requirement, choose the Comfort-Aire EA448F Wall Sleeve. For the exact 12100204000202 filter identifier, choose the matching Comfort Aire Filter. For a 7-1/2-inch by 13-inch filter, choose 12120300005844. For a Comfort-Aire REG-series display box assembly need, choose 17220300A17150. The best choice here comes from matching the component's named job and model references first, then using the listed price to compare like-for-like options.
