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Aprilaire Humidistat part 4594 is used in the following models:

Aprilaire 1150
Aprilaire 1160
Aprilaire 800
APRILAIRE 865

FILTERS FAST SHIPPING POLICY

Filters Fast offers economy free shipping every day on U.S. orders over $99 when shipping to the lower 48 states. This free shipping offer excludes Alaska and Hawaii, P.O. Box or APO/FPO/DPO and international orders. Orders under $99 ship for a fee to most destinations within the contiguous United States (excluding Hawaii and Alaska).

Filters Fast offers expedited shipping. When selecting any expedited shipping method, such as FedEx 2nd day or Overnight, your Transaction will be processed and Products shipped out the next business day. Business days are Monday through Friday. Any expedited delivery requests that are placed Friday through Sunday will not result in Products shipped until Monday. If the following Monday falls on a FedEx recognized holiday, your Products will be shipped on Tuesday.

Most Products ship within 1-2 business days after Transaction finalization, unless otherwise stated on the Product page on the Services. Your final shipping cost and estimated delivery time frame will be available to you during checkout.

We offer guaranteed same-day shipping on select Products with your preferred delivery method every Tuesday, Wednesday, and Thursday. When guaranteed same-day shipping is available on a Product, we will state this on the Product page, with the label "Ready to Ship". The "order within" countdown timer provides the window of time in which you must checkout to have your Products ship out the same day the Transaction is finalized. If a Transaction is finalized right at or after 2:00 PM EST, the applicable Products will ship the next business day. Our business days are Monday through Friday. Filters Fast also reserves the right, without cause, to make changes to any same-day shipping timeframe as same-day shipping may become unavailable within the allotted timeframe due to changes in inventory or high-volume capacity when you finalized your Transaction.

Once the shipping label is created, you will receive an email confirmation with the tracking information for your package. A Product with the "Ready to Ship" label does not apply to the delivery speed.

For expedited shipping, you will still need to select your preferred shipping method at checkout. Filters Fast is not responsible or liable for any shipping delays of any kind, including carrier delays, inclement weather, government restrictions, labor shortages, gas or utilities shortages, acts of God, etc.

Please note, some Products are special order and may require a longer ship-out and/or delivery time frame. These Product have a shipping timeframe stated on the Product page on the Services.

RETURNS AND REFUNDS POLICY

Filters Fast is happy to accept returns on items within 365 days of the original ship date. All returned Products are inspected and must be in a new, unused condition and contain all original parts, shrink wrap, protective seals, and components or, if used, must have been sold with the Satisfaction Guarantee Badge. We will not accept the return of any other Products, including those that have been damaged other than by the applicable carrier, used, or do not contain all original parts, shrink wrap, protective seals, and components.

Return requests must be processed using our self-service online portal. To access the online portal, login to your account by going to www.filtersfast.com and clicking on the My Account button.

Return Restrictions:

Filters Fast will not accept any returns on Products that were damaged during installation or because of incorrect installation.
Returns on custom air filters are not accepted.
After inspection, if your return is deemed damaged other by the carrier, we reserve the right to decline the return request, including any damage caused by water quality or usage.
In the event that Filters Fast makes an error in your Transaction, it must be reported within 365 days of receiving the applicable Product(s). After 365 days, Filters Fast reserves the right to deny a return request. We encourage our customers to check the contents of their packages as soon as they are received.
PLEASE DO NOT REFUSE ANY PACKAGES AS A METHOD OF RETURNING PRODUCTS TO US. If you refuse a package as a method of returning Products to us, and there is no proof of delivery back to Filters Fast, no return will be processed. In addition, all packages that are refused are subject to an additional $10.00 fee.
In order to maintain the highest levels of product integrity and sanitation standards, we do not offer returns for masks, mask filter replacements and commercial HEPA filters. ALL MASK, MASK FILTER REPLACEMENT AND COMMERCIAL HEPA FILTER TRANSACTIONS WILL BE FINAL SALES.

We encourage our customers to package their return carefully to avoid any damages in transit back to us.

Damage Due To Carrier Mishandling:

Filters Fast is not liable for damages to your Product(s) caused by the carrier that are reported to us after 365 days from the original ship date.

In the event that you receive Products damaged by the carrier, we will work to resolve the issue, which may include you returning the Products to us. Please follow these steps to submit a claim for Products that the carrier damaged:

Use the damage claim form via Filters Fast Self Service Portal.
Submit a clear photo of the damage.
All requests must be made within 365 days from the original shipment date.

Return Shipping Label:

Filters Fast offers convenient prepaid mailing labels for returns to customers in the contingent continental US.

FILTERS FAST REFUND POLICY

We inspect all returned items when they arrive at our distribution facility. If you comply with the Returns Policy and your return is a result of a Filters Fast error in processing your Transaction or a defective Product that is protected by the Satisfaction Guarantee, we will refund the full cost of the Product. Additionally, if you comply with the Returns Policy and depending on the circumstances, we may refund the full cost of Products that are damaged due to the mishandling of the carrier.

Refund Restrictions:

Filters Fast will not issue any refunds on Products that were damaged during installation or because of incorrect installation or that were otherwise damages, unless such damage was due to carrier mishandling.
Refunds on returned Products that are shipped to you by mistake or that are damaged by the mishandling of the carrier will only be granted on Products that are in a new and unused condition, with all parts, shrink wrap and components intact.
Original shipping costs are not refunded.
Refunds on custom air filters are not accepted.

You can expect your refund within 2-3 weeks from the date you return any Product eligible for a refund. In most cases, you will receive a refund sooner, but please take into account the amount of time required for return shipping (up to 10 days), product inspection at our distribution facility (up to 5 business days), and processing from your bank or credit card company (up to 5 business days). All refunds are issued to the original method of payment.