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  <xs:element id="nx_EUEngineeredComponentsUnitOneMember" abstract="true" name="EUEngineeredComponentsUnitOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_NAEngineeredComponentsUnitOneMemberMember" abstract="true" name="NAEngineeredComponentsUnitOneMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_FinanceLeaseLiabilityAndOtherFinancingObligationsToBePaidYearFive" abstract="false" name="FinanceLeaseLiabilityAndOtherFinancingObligationsToBePaidYearFive" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nx_AmountPurchasedUnderPurchaseObligations" abstract="false" name="AmountPurchasedUnderPurchaseObligations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="nx_NumberofReportableUnitswithGoodwillBalances" abstract="false" name="NumberofReportableUnitswithGoodwillBalances" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="nx_EffectiveIncomeTaxRateReconciliationPermanentDifferences" abstract="false" name="EffectiveIncomeTaxRateReconciliationPermanentDifferences" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nx_EffectiveIncomeTaxRateReconciliationUKPatentBoxBenefitPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationUKPatentBoxBenefitPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="nx_NAEngineeredComponentsUnitTwoMember" abstract="true" name="NAEngineeredComponentsUnitTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_PaymentForSettlementOfShareBasedCompensation" abstract="false" name="PaymentForSettlementOfShareBasedCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nx_NumberOfDefinedContributionPlans" abstract="false" name="NumberOfDefinedContributionPlans" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="nx_HighyieldbondMember" abstract="true" name="HighyieldbondMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_OneCustomerMember" abstract="true" name="OneCustomerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_CumulativeAssetRetirementObligationDeprecationAndAccretionPeriod" abstract="false" name="CumulativeAssetRetirementObligationDeprecationAndAccretionPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="nx_ConcentrationRiskNumberofMajorCustomersLostWhoCouldAdverselyAffectBusiness" abstract="false" name="ConcentrationRiskNumberofMajorCustomersLostWhoCouldAdverselyAffectBusiness" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="nx_BetweenOneandOneHalfandTwoandOneQuarterLeverageRatioMember" abstract="true" name="BetweenOneandOneHalfandTwoandOneQuarterLeverageRatioMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="nx_FinanceLeaseLiabilityAndOtherFinancingObligationsToBePaidYearTwo" abstract="false" name="FinanceLeaseLiabilityAndOtherFinancingObligationsToBePaidYearTwo" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nx_DescriptionOfNewAccountingPronouncementsRecentlyAdoptedAndNotYetAdoptedTextBlock" abstract="false" name="DescriptionOfNewAccountingPronouncementsRecentlyAdoptedAndNotYetAdoptedTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="nx_InventoryReserveRollforwardTableTextBlock" abstract="false" name="InventoryReserveRollforwardTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="nx_NonEmployeeDirectorsMember" abstract="true" name="NonEmployeeDirectorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nx_InterestRateScenarioAxis" abstract="true" name="InterestRateScenarioAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="nx_FinanceLeaseLiabilityAndOtherFinancingObligationsToBePaidYearFour" abstract="false" name="FinanceLeaseLiabilityAndOtherFinancingObligationsToBePaidYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nx_EffectiveIncomeTaxRateReconciliationChangeInUncertainTaxPosition" abstract="false" name="EffectiveIncomeTaxRateReconciliationChangeInUncertainTaxPosition" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nx_LeaseTermandDiscountRateLesseeTableTextBlock" abstract="false" name="LeaseTermandDiscountRateLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="nx_MinimumIncrementalBorrowing" abstract="false" name="MinimumIncrementalBorrowing" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nx_NoSingleTransactionOrSeriesOfRelatedTransactionsExceeded120000Member" abstract="true" name="NoSingleTransactionOrSeriesOfRelatedTransactionsExceeded120000Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_SwingLineMember" abstract="true" name="SwingLineMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_LMICustomMixingLLCMember" abstract="true" name="LMICustomMixingLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_ConcentrationRiskNumberOfCustomers" abstract="false" name="ConcentrationRiskNumberOfCustomers" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="nx_ShareBasedCompensationAwardTrancheFourMember" abstract="true" name="ShareBasedCompensationAwardTrancheFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_LesseeLeaseTermOfContract" abstract="false" name="LesseeLeaseTermOfContract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="nx_NAEngineeredComponentsUnitThreeMember" abstract="true" name="NAEngineeredComponentsUnitThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nx_DebtInstrumentRequiredLeverageRatio" abstract="false" name="DebtInstrumentRequiredLeverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="nx_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="nx_LineofCreditFacilityMaximumBorrowingCapacityCommittedAmount" abstract="false" name="LineofCreditFacilityMaximumBorrowingCapacityCommittedAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nx_EarningsPerShareDisclosureLineItems" abstract="true" name="EarningsPerShareDisclosureLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="nx_AccruedLiabilitiesFreight" abstract="false" name="AccruedLiabilitiesFreight" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nx_LeasesLiability" abstract="false" name="LeasesLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nx_FenestrationMember" abstract="true" name="FenestrationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_PropertyAssetsUsefulLifeTableTextBlock" abstract="false" name="PropertyAssetsUsefulLifeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="nx_NonfenestrationMember" abstract="true" name="NonfenestrationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_EffectiveIncomeTaxRateReconciliationTaxReturnToAccrualAdjustments" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxReturnToAccrualAdjustments" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nx_CreditFacilityMember" abstract="true" name="CreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_NACabinetComponentsMember" abstract="true" name="NACabinetComponentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_A2018CreditFacilityMember" abstract="true" name="A2018CreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLease" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLease" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nx_MaximumIncrementalBorrowing" abstract="false" name="MaximumIncrementalBorrowing" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nx_RFRLoansMember" abstract="true" name="RFRLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
