The fastest way to find, compare and buy the Dayton 1202 CFM rectangle replacement OEM blower.
Describe the wheel diameter, voltage, or equipment you're replacing a blower on. ChatMRO finds the exact Dayton match, shows alternatives, and gives you a quote — in seconds. No part number needed.
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AI-generated imageThe Dayton rectangle replacement OEM blower is a direct-drive, forward-curved centrifugal blower built into a compact rectangular housing, purpose-designed as an aftermarket replacement for the blower motors originally installed inside OEM equipment — laminar flow hoods, air conditioners, drying equipment, and general machine cooling systems are typical hosts. Unlike a general-purpose industrial blower sold as standalone equipment, this OEM-replacement class is engineered to drop into an existing equipment cavity with matching outlet flange dimensions and mounting footprint.
Lab equipment technicians, HVAC/R service providers, and OEM equipment maintainers rely on this specific blower class wherever an integrated equipment blower has failed and the original manufacturer's part is no longer available or is priced at a premium — the 1TDU2 model (replacing the earlier 4C831/4C831A designation) is one of the most commonly cross-referenced units in this category. Its cast-aluminum end shields dissipate motor heat, and dynamic balancing keeps operation smooth and quiet while maintaining CFM output as static pressure increases — a critical trait for blowers pulling air through filters, ducting, or other equipment-internal restrictions rather than operating in free air.
Common configuration: 8-1/4" forward-curved wheel diameter, direct drive (no belt), dual voltage 115/230VAC single-phase, 60/50 Hz, 1/2 HP, 1320-1390 RPM depending on voltage tap, 7.3A at 115V/3.7A at 230V, all-position ball bearing mounting, automatic overload protection, non-reversible rotation, 7-1/4" x 5-3/4" outlet flange dimension, and maximum inlet air temperature of 104°F. CFM output is published across a static pressure curve: 1,202 CFM at 0.000" SP down to roughly 1,100 CFM at 0.500" SP.
Stop second-guessing. Match your use case below — then let ChatMRO's AI surface the exact model, CFM curve, and alternatives in one natural-language search.
Cleanroom and laminar flow hood applications needing steady CFM through filter media resistance. This blower's static-pressure-holding performance dominates here.
Equipment originally built with the Dayton 4C831/4C831A blower needing an exact-fit aftermarket replacement. The 1TDU2 cross-reference dominates here.
Equipment needing sustained airflow for cooling electronics, drives, or process components.
Dayton (Grainger's private-label industrial brand) manufactures this OEM replacement blower under the current 1TDU2 model number, with cross-reference to the earlier 4C831/4C831A designation still commonly referenced in older equipment documentation. Here's how to navigate the part without a 40-tab browser session.
ChatMRO indexes the full Dayton OEM replacement blower catalogue. Search any product by description, application, or rough spec.
The equipment-integration workhorse. 8-1/4" forward-curved wheel, direct drive, 115/230VAC dual voltage, 1/2 HP, 1320/1380-1390 RPM depending on tap, 7.3/3.7A. Cast-aluminum end shields, dynamically balanced, all-position ball bearing mounting.
Search 1TDU2 Series →Earlier Dayton/Grainger part number for the same physical blower, commonly referenced in older equipment manuals and OEM documentation. Directly superseded by the current 1TDU2 designation with identical specifications.
Search 4C831/4C831A (Superseded) →Third-party manufactured units cross-referenced to fit the same equipment cavity and specifications as the Dayton 1TDU2/4C831. Motor specs typically matched at 1/2 HP, 1380 RPM, 7.3/3.7A, 115/230V, all-position mounting.
Search Aftermarket Cross-Reference Series →Use this table as a decision shortcut. Ask ChatMRO for the exact part once you know which row fits your spec.
| Source | Part Number | CFM @ 0.000" SP | Best For | Voltage | Price Positioning | ChatMRO Verdict |
|---|---|---|---|---|---|---|
| Dayton (current) | 1TDU2 | 1,202 CFM | Direct OEM-quality replacement | 115/230VAC | Standard OEM pricing | Best when OEM-grade quality and warranty support matter most |
| Dayton (legacy reference) | 4C831/4C831A | 1,202 CFM | Cross-referencing older equipment documentation | 115/230VAC | Same as 1TDU2 (superseded) | Use this designation only to confirm cross-reference to current 1TDU2 |
| Aftermarket Equivalent A | PTDU2-style | 1,202 CFM | Budget-conscious replacement with matched specs | 115/230VAC | Lower cost than Dayton OEM | Good value alternative when exact Dayton branding isn't required |
| Aftermarket Equivalent B | Various cross-ref SKUs | ~1,200 CFM | General equipment cooling, non-critical applications | 115/230VAC | Lower cost | Verify exact flange dimensions match before ordering |
| Smaller Dayton Blower (comparison) | 1TDR9/1TDR6 style | 76-150 CFM | Small equipment needing far less airflow | 115V | Lower cost, smaller unit | Not a substitute — confirm your equipment actually needs ~1200 CFM |
| Generic Import Rectangular Blower | Variable | Variable (stated) | Budget, occasional light use | Variable | Lowest cost | Verify static pressure performance curve before relying on stated CFM |
Not sure which row is yours? Describe your application to ChatMRO and get an instant AI-matched recommendation with datasheets.
Traditional catalogues force you to know the exact MPN before you find anything. ChatMRO flips that: describe what you need in plain English, and the AI finds the right blower from 30M+ indexed parts.
In plain language — by wheel diameter, voltage, or equipment being repaired. No MPN required.
Natural language processing maps your description to the closest-fit products across brands and specs.
Cross-brand equivalents, lower-cost substitutes, and in-stock alternatives shown side-by-side.
Add to cart or request RFQ directly from the results. No phone calls. No email chains.
Whether you're a lab technician replacing a failed laminar flow hood blower, or an equipment maintainer sourcing a hard-to-find OEM part — use this framework before you procure.
Check the equipment's nameplate or manual for a Dayton 1TDU2 or 4C831/4C831A reference — this immediately confirms exact-fit compatibility rather than relying on CFM alone.
This blower uses a 7-1/4" x 5-3/4" outlet flange — confirm your equipment's cavity and ducting connection matches this dimension before ordering a replacement.
The 8-1/4" wheel diameter drives the blower's overall housing size — confirm your equipment's internal cavity has sufficient clearance before purchase.
If your equipment pulls air through a filter or restrictive ducting, check the CFM figure at a realistic static pressure (e.g., 0.250"-0.500" SP) rather than the 0.000" SP free-air maximum.
This blower is dual voltage (115/230V) but is not recommended for speed control — if your equipment uses a variable-speed drive on the blower, confirm compatibility before ordering.
A blower rated for the same CFM but with different flange dimensions won't connect to your existing equipment ducting. Search by function on ChatMRO — the AI surfaces exact matches AND available substitutes with matching flange dimensions.
This blower is explicitly not recommended for speed control — attempting to run it through a variable frequency drive or similar speed controller can cause premature motor failure. If the motor hums but won't spin, check its run capacitor before replacing the whole blower.
Older equipment documentation may only reference the superseded 4C831/4C831A part number — confirming this cross-references to the current 1TDU2 avoids confusion when the older number returns no results.
Describing your application to ChatMRO takes 30 seconds. The AI reads the full Dayton OEM blower catalogue so you don't have to.
Just describe what you need. ChatMRO finds the right rectangle replacement OEM blower in seconds.
The Dayton 1TDU2 rectangle replacement OEM blower is among the most widely cross-referenced integrated blower units for laminar flow hoods, air conditioning equipment, drying systems, and general machine cooling applications. The part directly supersedes the earlier Dayton 4C831/4C831A designation still commonly found in older equipment documentation, sharing an identical 1,202 CFM rating, 8-1/4" forward-curved wheel, and 115/230V dual voltage specification. Procurement professionals, lab equipment technicians, and OEM equipment maintainers in India, Southeast Asia, and North America regularly source this blower for cleanroom equipment repair, HVAC/R component replacement, and general equipment-integrated air moving needs.
ChatMRO simplifies this procurement process by providing AI-powered natural language search across a catalogue of 30 million+ indexed industrial parts. Buyers no longer need to memorize MPN codes or navigate multi-level filter trees to find the right blower. A simple description of the wheel diameter, voltage, or equipment being repaired is sufficient to surface the correct Dayton product alongside cross-brand alternatives and real-time pricing.
