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Warranties | 12 Months Ended
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Dec. 31, 2022
Guarantees [Abstract] |
Warranties | Warranties The Company has product warranties with various terms from one year from the date of first use or 18 months for parts, data center cooling solutions, and cleanroom systems to 25 years for certain heat exchangers. The Company has an obligation to replace parts if conditions under the warranty are met. A provision is made for estimated warranty costs at the time the related products are sold based upon the warranty period, historical trends, new products, and any known identifiable warranty issues. Changes in the warranty accrual are as follows:
| Years Ended December 31,
| 2022 |  | 2021 |  | 2020
Warranty accrual: | (in thousands)
Balance, beginning of period | $ | 13,769 |  |  | $ | 13,522 |  |  | $ | 12,652 |
Payments made | (6,584) |  |  | (6,734) |  |  | (5,751) |
Provisions | 8,497 |  |  | 6,351 |  |  | 6,621 |
Assumed in business combination (Note 4) | — |  |  | 630 |  |  | — |
Balance, end of period | $ | 15,682 |  |  | $ | 13,769 |  |  | $ | 13,522 |
Warranty expense: | $ | 8,497 |  |  | $ | 6,351 |  |  | $ | 6,621 |

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- Definition The entire disclosure for standard and extended product warranties and other product guarantee contracts, including a tabular reconciliation of the changes in the guarantor's aggregate product warranty liability for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -URI http://asc.fasb.org/topic&trid=2155896 + Details
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