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Mercury Floor Machines L-21E Lo-Boy Floor Machine โ€“ 21

Mercury Floor Machines L-21E Lo-Boy Floor Machine โ€“ 21", 175 RPM, 105 lbs

Brand: Mercury Floor MachinesSKU: L-21EIn Stock – Ready to Ship
$1,789.00$1,848.00Save $59.00

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Mercury L-21E Lo-Boy: 21" Ultra-Quiet Floor Machine at 175 RPM

The L-21E is the largest apron size in the Lo-Boy series โ€” 21" at 175 RPM, weighing 105 lbs. Like the L-19E and L-20E, the L-21E positions its gearbox under the apron rather than in the handle column, which reduces noise transmission through the machine frame. At 21", it offers the widest coverage in the Lo-Boy lineup while retaining the acoustic profile that makes the series suitable for occupied-building cleaning.

L-21E Motor, Transmission, and Pad Specifications

  • Apron size: 21" โ€” the widest in the Lo-Boy series; covers more floor per pass than the 19" or 20" models
  • Speed: 175 RPM โ€” identical to the Hercules series; low noise output at the same cleaning speed
  • Machine weight: 105 lbs โ€” 2 lbs lighter than the L-20E (103 lbs) wait, 2 lbs heavier; heavier than L-20E (103 lbs) and L-19E (102 lbs)
  • Motor: 1.5 HP A/C โ€” same power as the Hercules series; draws 13โ€“15A under load
  • Gearbox location: Under the apron โ€” enclosed in the low-profile housing for noise dampening
  • Included accessories: 19" pad driver and 18" rotary brush
  • Electrical: 13โ€“15A draw; two circuits recommended for sustained operation

Where the 21" Lo-Boy Fits in Large-Format Quiet Cleaning

The L-21E is the Lo-Boy model for large open floor areas โ€” hospital atria, hotel lobbies, airport concourses, and university commons where a 19" or 20" machine would require more passes to cover the same square footage. In these environments, the noise reduction benefit of the Lo-Boy gearbox design matters most: the larger the open space, the further machine noise travels, and the more disruptive standard-weight floor machines are to occupants or visitors. At 105 lbs, the L-21E is 3 lbs lighter than the H-21E Hercules (108 lbs) โ€” a marginal difference in cleaning performance but a meaningful one for operators who move the machine frequently between floors or load it onto freight elevators. If the priority is maximum pad pressure and noise is not a constraint, the H-21E delivers 3 additional pounds over the same 21" pad area.

Under-Apron Gearbox Design at 21" Scale

The Lo-Boy's gearbox location under the apron provides greater noise benefit at larger apron sizes because the apron housing creates a larger acoustic enclosure around the rotating gear assembly. At 21", the apron deck spans more surface area, giving the gearbox more physical shielding from the surrounding environment. This is why the L-21E is quieter in measured operation than a hypothetical standard-height machine with the same 21" apron: more apron area means more enclosure. At 105 lbs and 175 RPM, the gearbox is handling the same torque load as the Hercules equivalent โ€” the engineering difference is acoustic management, not power delivery. For facilities that run overnight cleaning and need to transition to daytime operations without changing machines, the L-21E covers the full floor area of the H-21E at lower noise output.

Specification Value
Model L-21E
Apron Size 21"
Speed 175 RPM
Machine weight 105 lbs
Motor 1.5 HP A/C
Amperage Draw 13โ€“15A (2 circuits)
Gearbox Location Under the apron
Pad Driver Included 19"
Rotary Brush Included 18"

Documents

Owner's Manual ยท Parts List ยท Sell Sheet ยท Wiring Diagram

Manufacturer's Warranty

This product comes with a full manufacturer's warranty. All warranty claims are handled directly by the manufacturer.

For specific warranty details, please contact us at +1 (978) 295-7538 or email info@uscleaningtools.com

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We supply contractors, restoration companies, property managers, schools, government agencies, and other tax-exempt organizations.

How to place a tax-exempt order:

  1. Write to us through our Contact Us page or email info@uscleaningtools.com and attach your valid tax exemption certificate (state resale or exemption certificate).
  2. We verify your certificate and mark your account tax-exempt — usually within one business day.
  3. Place your order and sales tax will not be charged.

For volume pricing or purchase orders, call +1 (978) 295-7538.

Shipping & Returns

Free shipping on most brands for orders over $300, delivered to the lower 48 states. Any brand-specific freight rate is shown at checkout before you pay.

Processing & delivery: in-stock orders are processed within 1–2 business days and typically deliver in 5–7 business days. Tracking is emailed within 24 hours of shipment. Built-to-order and backordered equipment shows its lead time on this page.

Freight deliveries: inspect your equipment on arrival and note any damage on the delivery receipt. Items damaged in transit or defective on arrival are fully covered at no cost to you.

Cancellations: cancel any time before your order ships for a full 100% refund.

30-day returns: return unused equipment in its original packaging within 30 days of delivery. Change-of-mind returns are subject to a restocking fee. To start a return, email info@uscleaningtools.com or call +1 (978) 295-7538.

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Frequently Asked Questions

How does the L-21E compare to the H-21E Hercules?
The L-21E weighs 105 lbs versus the H-21E's 108 lbs. Both use a 21" apron at 175 RPM with a 1.5 HP A/C motor. The H-21E has a dual-capacitor motor and triple-planetary gearbox designed for maximum torque. The L-21E's gearbox is positioned under the apron for noise dampening, making it quieter in operation. The H-21E delivers 3 more lbs of pad pressure; the L-21E is the choice when daytime cleaning in occupied spaces is the primary use case.
How does the L-21E compare to the L-20E in the Lo-Boy series?
The L-21E weighs 105 lbs with a 21" apron. The L-20E weighs 103 lbs with a 20" apron. Both share the same gearbox-under-apron design and 175 RPM speed. The L-21E covers 1" more floor width per pass and has 2 lbs more machine weight, giving slightly higher pad pressure. In open areas where machine width is not a constraint, the L-21E is more efficient.
What pad sizes are compatible with the L-21E?
The L-21E includes a 19" pad driver and an 18" rotary brush. Standard 19" floor pads โ€” black (stripping), green (scrubbing), red (cleaning), white or tan (buffing) โ€” fit the included pad driver. The 18" brush handles textured tile, grout, and rough-surface scrubbing.
What electrical supply does the L-21E require?
The L-21E draws 13โ€“15A under load. Two 15A circuits are recommended for extended stripping or scrubbing. Single-circuit operation is feasible for buffing and light maintenance cleaning. In large open spaces where the L-21E is most commonly used, verify that available outlets are within cord reach or use a properly rated extension cord rated for the amperage.
Is the L-21E appropriate for stripping finish in occupied spaces?
Yes, but note that stripping generates chemical fumes regardless of machine noise. The L-21E reduces equipment noise during stripping, but chemical ventilation requirements remain unchanged. In occupied spaces, stripping is typically still performed in sections with ventilation, using the L-21E's lower noise output to minimize disruption from the machine itself while odor management is handled separately.
How large an area can the L-21E clean per hour?
At 175 RPM with a 21" pad, the L-21E covers approximately 15,000โ€“20,000 square feet per hour for buffing or light scrubbing at a standard walking pace. Stripping reduces coverage to 3,000โ€“6,000 square feet per hour depending on finish condition, chemical dwell time, and the number of passes required.

Frequently Asked Questions

1. What payment methods can I use?

We accept Visa, MasterCard, American Express, Diners Club, Discover, major debit cards, and digital wallets like PayPal, Google Pay, Meta Pay, and Apple Pay.

2. When will my payment be processed?

Your credit/debit card or PayPal account will be charged when you place your order. Secure payment processing protects your information.

3. Will I receive an order confirmation?

Yes, a confirmation email will be sent to the provided email address once the order is placed.

4. How long does it take to process an order?

Orders are processed within 1-2 business days and then prepared for shipment.

5. How long does it take for my order to arrive?

Estimated arrival time (ETA) is 5-7 business days for all orders.

6. Do you offer warranty?

All our products come with a manufacturer warranty of at least 1 year, depending on the brand.

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